TY  - RPRT
TI  - Difficulties in a multipractice study.
AU  - N Damsbo
AU  - J Olsen
PY  - 1983
DO  - 10.3109/02813438309038481
UR  - https://pubmed.ncbi.nlm.nih.gov/6545041/
ID  - 6545041
ER  -