Lewan, R B <br/><br/>
Nifedipine and ritodrine in the management of preterm labor: a randomized multicenter trial.  [electronic resource] 

 -  Obstetrics and gynecology  Dec 1997 
 - 1023-4 p.  digital 
<br/><br/> Publication Type: Letter; Comment 
<br/><br/><label>ISSN: </label>0029-7844 
<br/><br/><label>Standard No.: </label>10.1016/s0029-7844(97)00574-7  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bias<br/>Female<br/>Humans<br/>Nifedipine--therapeutic use<br/>Obstetric Labor, Premature--drug therapy<br/>Pregnancy<br/>Research Design--standards<br/>Ritodrine--therapeutic use<br/>Tocolytic Agents--therapeutic use