TY  - RPRT
TI  - [Randomized clinical trials: variants, randomization methods, analysis, ethical issues and regulations].
AU  - Eduardo Lazcano-Ponce
AU  - Eduardo Salazar-Martínez
AU  - Pedro Gutiérrez-Castrellón
AU  - Angélica Angeles-Llerenas
AU  - Adolfo Hernández-Garduño
AU  - José Luis Viramontes
DO  - 10.1590/s0036-36342004000600012
UR  - https://pubmed.ncbi.nlm.nih.gov/15624861/
ID  - 15624861
ER  -