TY  - RPRT
TI  - Basic problems in controlled trials.
AU  - R Burkhardt
AU  - G Kienle
PY  - 1983
DO  - 10.1136/jme.9.2.80
UR  - https://pubmed.ncbi.nlm.nih.gov/6876102/
ID  - 6876102
ER  -