Variation in the nulliparous, term, singleton, vertex cesarean delivery rate

Daniel N. Pasko, Paula McGee, William A. Grobman, Jennifer L. Bailit, Uma M. Reddy, Ronald J. Wapner, Michael W. Varner, John M. Thorp, Kenneth J. Leveno, Steve N. Caritis, Mona Prasad, George Saade, Yoram Sorokin, Dwight J. Rouse, Sean C. Blackwell, Jorge E. Tolosa