TY  - RPRT
TI  - Clinical trials: introduction.
AU  - P Held
AU  - H Wedel
AU  - L Wilhelmsen
PY  - 2003
DO  - 10.1046/j.1365-2796.2003.01202.x
UR  - https://pubmed.ncbi.nlm.nih.gov/12859690/
ID  - 12859690
ER  -