The Kaiser Permanente prenatal smoking cessation trial: when more isn't better, what is enough?
Ershoff
D H
DH
Kaiser Permanente Southern California Group, Pasadena, California, USA.
Quinn
V P
VP
Boyd
N R
NR
Stern
J
J
Gregory
M
M
Wirtschafter
D
D
D000328:Adult; D005260:Female; D006279:Health Maintenance Organizations; D006293:Health Promotion; D006801:Humans; D011247:Pregnancy; D011295:Prenatal Care; D016540:Smoking Cessation; D000074606:Smoking Prevention