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Aims:  Nifedipine is believed to be a superior tocolytic agent on the basis of efficacy and side-effect profile, but was never prospectively evaluated in a placebo-controlled randomized clinical trial (RCT). In our study, we sought to identify limitations in participation for a would-be RCT comparing nifedipine to placebo.

Feasibility of a randomized controlled trial testing nifedipine vs. placebo for the treatment of preterm labor