pubmed:affiliation |
Department of Maternal and Child Health, The University of North Carolina, School of Public Health, 407-C Rosenau Hall, CB 7445, Chapel Hill, NC 27599, USA.
|
pubmed:publicationType |
Journal Article,
Comparative Study,
Randomized Controlled Trial,
Multicenter Study,
Research Support, N.I.H., Extramural
|