这个词是什么意思？
Studies in which variables relating to an individual or group of individuals are assessed over a period of time.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D008137 · MeSH 2026。
Courtesy of the U.S. National Library of Medicine. Annual snapshot; later updates may not be reflected. NLM does not endorse this service.