[1] Columbia Univ, Sch Nursing, New York, NY USA
[2] Columbia Univ, Mailman Sch Publ Hlth, Heilbrunn Dept Populat & Family Hlth, New York, NY USA
[3] Univ S Florida, Coll Publ Hlth, Tampa, FL USA
[4] Univ Florida, Coll Nursing, Dept Family Community & Hlth Syst Sci, Gainesville, FL USA
[5] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY USA
[6] Johns Hopkins Univ, Sch Nursing, Baltimore, MD USA
[7] Every Mother Counts, New York, NY USA
[8] Northwestern Univ, Ctr Behav Intervent Technol, Dept Prevent Med, Chicago, IL USA
[9] Columbia Univ, Dept Med, Div Infect Dis, Irving Med Ctr, New York, NY USA
[10] Sch Nursing, 560 W 168th St, New York, NY 10032 USA