Multicenter randomized trial of cerclage for preterm birth prevention in high-risk women with shortened midtrimester cervical length

John Owen, Gary Hankins, Jay D. Iams, Vincenzo Berghella, Jeanne S. Sheffield, Annette Perez-Delboy, Robert S. Egerman, Deborah A. Wing, Mark Tomlinson, Richard Silver, Susan M. Ramin, Edwin R. Guzman, Michael Gordon, Helen Y. How, Eric J. Knudtson, Jeff M. Szychowski, Suzanne Cliver, John C. Hauth