TY  - RPRT
TI  - Problems, pitfalls, and opportunities in long-term randomized trials.
AU  - A R Feinstein
PY  - 1989
DO  - 10.1007/978-3-642-74615-4_11
UR  - https://pubmed.ncbi.nlm.nih.gov/2818694/
ID  - 2818694
ER  -