Objective To explore the track of professional identity of undergraduate nursing students,so as to provide reference for improving their professional identity and reducing the brain drain of nursing students.Methods In-depth interviews were conducted with 12 undergraduate nursing students,and the data were analyzed by grounded theory.Results One core category is the track of professional identity,and five categories are the reasons of major choice,inherent professional cognition,systematic learning improvement,practical experience change and career choice inclination.Conclusion Inherent professional cognition may run through all stages of nursing stu-dents'professional identity.Systematic study and clinical practice will change nursing students'professional iden-tity,and professional identity is no longer a sufficient and necessary condition for determining nursing students'career choice.Nursing educators and nursing managers should understand the track of nursing students'profes-sional identity,improve their professional identity,reduce the brain drain of nursing talents and promote the stabili-ty of nurses.

Objective To explore the track of professional identity of undergraduate nursing students,so as to provide reference for improving their professional identity and reducing the brain drain of nursing students.Methods In-depth interviews were conducted with 12 undergraduate nursing students,and the data were analyzed by grounded theory.Results One core category is the track of professional identity,and five categories are the reasons of major choice,inherent professional cognition,systematic learning improvement,practical experience change and career choice inclination.Conclusion Inherent professional cognition may run through all stages of nursing stu-dents'professional identity.Systematic study and clinical practice will change nursing students'professional iden-tity,and professional identity is no longer a sufficient and necessary condition for determining nursing students'career choice.Nursing educators and nursing managers should understand the track of nursing students'profes-sional identity,improve their professional identity,reduce the brain drain of nursing talents and promote the stabili-ty of nurses.

Objective To construct the performance evaluation index system of head nurses in tertiary grade A hospitals in Heilongjiang Province,in order to provide reference for clinical nursing management.Methods Through literature analysis and theoretical research,the framework and content of performance evaluation index system for head nurses in tertiary grade A hospitals in Heilongjiang Province were preliminarily established,and two rounds of expert letters were conducted by Delphi method,and finally the performance evaluation index system for head nurses in tertiary grade A hospitals in Heilongjiang Province was established.Results The evaluation index system of head nurses'performance in a tertiary grade A hospital in Heilongjiang Province included 5 first-class indicators,14 second-class indicators and 49 third-class indicators,and the expert consultation was highly reliable.Conclusion The construction of the performance evaluation index system for head nurses in tertiary hospitals in Heilongjiang Province can not only provide reference for nursing managers and researchers at all levels of medical institutions in the province,but also provide practical guidance for head nurses to improve their own nursing management level.

Objective To explore the track of professional identity of undergraduate nursing students,so as to provide reference for improving their professional identity and reducing the brain drain of nursing students.Methods In-depth interviews were conducted with 12 undergraduate nursing students,and the data were analyzed by grounded theory.Results One core category is the track of professional identity,and five categories are the reasons of major choice,inherent professional cognition,systematic learning improvement,practical experience change and career choice inclination.Conclusion Inherent professional cognition may run through all stages of nursing stu-dents'professional identity.Systematic study and clinical practice will change nursing students'professional iden-tity,and professional identity is no longer a sufficient and necessary condition for determining nursing students'career choice.Nursing educators and nursing managers should understand the track of nursing students'profes-sional identity,improve their professional identity,reduce the brain drain of nursing talents and promote the stabili-ty of nurses.

Objective To explore the track of professional identity of undergraduate nursing students,so as to provide reference for improving their professional identity and reducing the brain drain of nursing students.Methods In-depth interviews were conducted with 12 undergraduate nursing students,and the data were analyzed by grounded theory.Results One core category is the track of professional identity,and five categories are the reasons of major choice,inherent professional cognition,systematic learning improvement,practical experience change and career choice inclination.Conclusion Inherent professional cognition may run through all stages of nursing stu-dents'professional identity.Systematic study and clinical practice will change nursing students'professional iden-tity,and professional identity is no longer a sufficient and necessary condition for determining nursing students'career choice.Nursing educators and nursing managers should understand the track of nursing students'profes-sional identity,improve their professional identity,reduce the brain drain of nursing talents and promote the stabili-ty of nurses.

Objective To explore the track of professional identity of undergraduate nursing students,so as to provide reference for improving their professional identity and reducing the brain drain of nursing students.Methods In-depth interviews were conducted with 12 undergraduate nursing students,and the data were analyzed by grounded theory.Results One core category is the track of professional identity,and five categories are the reasons of major choice,inherent professional cognition,systematic learning improvement,practical experience change and career choice inclination.Conclusion Inherent professional cognition may run through all stages of nursing stu-dents'professional identity.Systematic study and clinical practice will change nursing students'professional iden-tity,and professional identity is no longer a sufficient and necessary condition for determining nursing students'career choice.Nursing educators and nursing managers should understand the track of nursing students'profes-sional identity,improve their professional identity,reduce the brain drain of nursing talents and promote the stabili-ty of nurses.

Objective To explore the track of professional identity of undergraduate nursing students,so as to provide reference for improving their professional identity and reducing the brain drain of nursing students.Methods In-depth interviews were conducted with 12 undergraduate nursing students,and the data were analyzed by grounded theory.Results One core category is the track of professional identity,and five categories are the reasons of major choice,inherent professional cognition,systematic learning improvement,practical experience change and career choice inclination.Conclusion Inherent professional cognition may run through all stages of nursing stu-dents'professional identity.Systematic study and clinical practice will change nursing students'professional iden-tity,and professional identity is no longer a sufficient and necessary condition for determining nursing students'career choice.Nursing educators and nursing managers should understand the track of nursing students'profes-sional identity,improve their professional identity,reduce the brain drain of nursing talents and promote the stabili-ty of nurses.

Objective To explore the track of professional identity of undergraduate nursing students,so as to provide reference for improving their professional identity and reducing the brain drain of nursing students.Methods In-depth interviews were conducted with 12 undergraduate nursing students,and the data were analyzed by grounded theory.Results One core category is the track of professional identity,and five categories are the reasons of major choice,inherent professional cognition,systematic learning improvement,practical experience change and career choice inclination.Conclusion Inherent professional cognition may run through all stages of nursing stu-dents'professional identity.Systematic study and clinical practice will change nursing students'professional iden-tity,and professional identity is no longer a sufficient and necessary condition for determining nursing students'career choice.Nursing educators and nursing managers should understand the track of nursing students'profes-sional identity,improve their professional identity,reduce the brain drain of nursing talents and promote the stabili-ty of nurses.

Objective To explore the track of professional identity of undergraduate nursing students,so as to provide reference for improving their professional identity and reducing the brain drain of nursing students.Methods In-depth interviews were conducted with 12 undergraduate nursing students,and the data were analyzed by grounded theory.Results One core category is the track of professional identity,and five categories are the reasons of major choice,inherent professional cognition,systematic learning improvement,practical experience change and career choice inclination.Conclusion Inherent professional cognition may run through all stages of nursing stu-dents'professional identity.Systematic study and clinical practice will change nursing students'professional iden-tity,and professional identity is no longer a sufficient and necessary condition for determining nursing students'career choice.Nursing educators and nursing managers should understand the track of nursing students'profes-sional identity,improve their professional identity,reduce the brain drain of nursing talents and promote the stabili-ty of nurses.

Thyroid carcinoma is closely related to environmental factors. Gene mutations and molecular biological changes of gland tissue caused by environmental changes are important factors inducing thyroid carcinoma. Although the molecular mechanism of thyroid carcinoma has not been fully elucidated,increasingly specific genetic changes and molecular markers for thyroid carcinoma have been discovered with the development of molecular biology techniques. This article reviews the recent progresses on the etiology,specific molecular markers,diagnosis and targeted therapies of thyroid carcinoma,so as to provide theoretical support for the clinical diagnosis and treatment of thyroid carcinoma.