Carcinoma, Neuroendocrine ; pathology ; Carcinoma, Pancreatic Ductal ; pathology ; Carcinoma, Papillary ; pathology ; Concept Formation ; Humans ; Neuroendocrine Tumors ; pathology ; Pancreatic Neoplasms ; classification ; pathology ; World Health Organization

Animals ; Biological Specimen Banks ; China ; Humans ; Immunohistochemistry ; standards ; Pathology ; standards ; trends ; Pathology, Clinical ; standards ; trends ; Quality Control ; Translational Medical Research

Child ; China ; Endoscopy, Gastrointestinal ; Gastrointestinal Diseases ; diagnosis ; therapy ; Gastrointestinal Motility ; Humans ; Infection Control ; Pediatrics ; methods ; trends

Animals ; Forecasting ; Gene Expression Profiling ; methods ; Humans ; Neoplasms ; genetics ; metabolism ; pathology ; Pathology ; education ; methods ; trends ; Proteomics ; methods

Humans ; Immunohistochemistry ; Paraganglioma ; classification ; metabolism ; pathology ; S100 Proteins ; analysis

Academies and Institutes ; Communication ; Congresses as Topic ; Humans

Diagnosis ; Humans ; Pathology ; methods

Diagnosis ; Humans ; Medical Laboratory Science ; methods ; Pathology, Clinical ; methods ; standards ; Prognosis

Child ; Food Hypersensitivity ; Gastrointestinal Diseases ; etiology ; immunology ; Humans

After the importance of literature definition and the main bases to define literature were described, including its major nature一knowledge information, signals displayed in knowledge information-words,symbols,pictures, audio frequency, visual frequency, and external form of knowledge information-material media, and the solidification process of knowledge information on media-records, the different definitions of literature were analyzed with some commends, the 4 major elements of literature were summarized, namely knowledge information, media, records, and words, symbols and pictures, etc.