Recruitment and retention of women in a large randomized control trial to reduce repeat preterm births: the Philadelphia Collaborative Preterm Prevention Project.
Webb
David A
DA
Department of Adolescent Medicine, Children's Hospital of Philadelphia, 3535 Market Street, Philadelphia, PA 19104, USA. WEBBD@email.chop.edu
Coyne
James C
JC
Goldenberg
Robert L
RL
Hogan
Vijaya K
VK
Elo
Irma T
IT
Bloch
Joan R
JR
Mathew
Leny
L
Bennett
Ian M
IM
Dennis
Erika F
EF
Culhane
Jennifer F
JF