TY  - RPRT
TI  - Multicenter randomized, controlled trial of a preterm birth prevention program. Collaborative Group on Preterm Birth Prevention.
PY  - 1993
DO  - 10.1016/0002-9378(93)90087-y
UR  - https://pubmed.ncbi.nlm.nih.gov/8362947/
ID  - 8362947
ER  -