TY  - RPRT
TI  - Large trials with simple protocols: indications and contraindications.
AU  - J Lubsen
AU  - J G Tijssen
PY  - 1989
DO  - 10.1016/0197-2456(89)90054-8
UR  - https://pubmed.ncbi.nlm.nih.gov/2605964/
ID  - 2605964
ER  -