TY  - RPRT
TI  - AIDS: methodological problems in studying its prevention and spread.
AU  - E M Ankrah
PY  - 1989
DO  - 10.1016/0277-9536(89)90275-x
UR  - https://pubmed.ncbi.nlm.nih.gov/2762857/
ID  - 2762857
ER  -