TY  - RPRT
TI  - Retrospective data collection using event history calendars.
AU  - Kristy K Martyn
AU  - Robert F Belli
DO  - 10.1097/00006199-200207000-00008
UR  - https://pubmed.ncbi.nlm.nih.gov/12131240/
ID  - 12131240
ER  -