The epidemiology of mental retardation:
✍
Leonard, Helen ;Wen, Xingyan
📂
Article
📅
2002
🏛
John Wiley and Sons
🌐
English
⚖ 205 KB
## Abstract There are a number of problems and challenges in relating the science of epidemiology to mental retardation (MR). These relate to how MR is defined and classified and how these definitions may change over time. These as well as other differences in ascertainment sources and methods need