AU  - Roos C, Spaanderman MA, Schuit E, et al
TI  - Effect of maintenance tocolysis with nifedipine in threatened preterm labor on perinatal outcomes: A randomized controlled trial
PT  - JOUR
DP  - 2013
TA  - JAMA
pages = {41-47},
VI  - 309
IP  - 1
AID  - 10.1001/jama.2012.153817 [doi]
4100  - http://dx.doi.org/10.1001/jama.2012.153817
SO  - JAMA January 2, 2013 309(1):41