TY  - GEN
AU  - Porta Serra,M
TI  - [Clinical investigation methods: errors, fallacies and challenges]
SN  - 0025-7753
PY  - 1990///0423
KW  - Bias
KW  - Humans
KW  - Random Allocation
KW  - Research Design
N1  - Publication Type: Journal Article; Review
ER  -