这个词是什么意思？
The study, based on direct observation, use of statistical records, interviews, or experimental methods, of actual practices or the actual impact of practices or policies.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D036262 · 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.