 In order to track changes consistently throughout the course of CP and facilitate the evaluation and study of CP, a dedicated database, CP Database version number 2.1, YINMA Information Technology Inc., Shanghai, China, was established to collect clinical data of CP patients who were admitted to our centers. Data befor CP Database established were retrospectively collected according to the electronic medical record system and complemented through telephone, letter, and e-mail inquiries. Data were prospectively collected since CP Database was established. The following information was documented in detail: demographic data age, sex, birthplace, et al, course of CP, medical history, history of other diseases, smoking and alcohol history, family history of pancreatic diseases and diabetes mellitus DM, laboratory and imaging findings, and treatment strategy. 