by Lopez, Laureen M, Grey, Thomas W, Stuebe, Alison M, Chen, Mario, Truitt, Sarah T, Gallo, Maria F
Published in Cochrane database of systematic reviews (20.03.2015)

by Lew, Robyn M., Cwiak, Carrie A., Truitt, Sarah T., Jensen, Jeffrey T., Nichols, Mark D., Edelman, Alison B.
Published in Obstetrics and gynecology (New York. 1953) (01.04.2005)