title: Too close for comfort.
authors.affiliation: Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX. Electronic address: Kenneth.Leveno@UTSouthwestern.edu.
authors.forename: Kenneth J
authors.initials: KJ
authors.lastname: Leveno
authors.affiliation: Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX.
authors.forename: Donald D
authors.initials: DD
authors.lastname: McIntire
authors.affiliation: Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX.
authors.forename: David B
authors.initials: DB
authors.lastname: Nelson