TY  - RPRT
TI  - Alternative designs to study outcomes: the tonsillectomy case.
AU  - L L Roos
PY  - 1979
DO  - 10.1097/00005650-197911000-00001
UR  - https://pubmed.ncbi.nlm.nih.gov/502614/
ID  - 502614
ER  -