pubmed:affiliation |
Department of Epidemiology, University of Pittsburgh, 130 N Bellefield Ave, Room 550, Pittsburgh, PA 15213, USA. kullerl@edc.pitt.edu
|
pubmed:publicationType |
Journal Article,
Randomized Controlled Trial,
Research Support, Non-U.S. Gov't,
Multicenter Study,
Research Support, N.I.H., Extramural
|