Roberts James M, Catov Janet M
Department of Obstetrics, Gynecology & Reproductive Sciences, University of Pittsburgh, Magee-Womens Research Institute, Pittsburgh, PA 15213, USA; Department of Epidemiology, University of Pittsburgh, Magee-Womens Research Institute, Pittsburgh, PA 15213, USA.
Department of Epidemiology, University of Pittsburgh, Magee-Womens Research Institute, Pittsburgh, PA 15213, USA.
Lancet. 2007 May 26;369(9575):1765-1766. doi: 10.1016/S0140-6736(07)60713-2.