TY  - RPRT
TI  - [An effective method to reduce bias between two compared groups: propensity score].
AU  - Shou-jun Zhao
AU  - Yong Zhang
AU  - Xuan-yi Wang
AU  - Yan-ning Gao
PY  - 2003
UR  - https://pubmed.ncbi.nlm.nih.gov/12848923/
ID  - 12848923
ER  -