|
pubmed:affiliation |
Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, MN 55455, USA. xiaohong@biostat.umn.edu
|
|
pubmed:publicationType |
Journal Article,
Comparative Study,
Research Support, U.S. Gov't, P.H.S.,
Research Support, Non-U.S. Gov't,
Evaluation Studies,
Research Support, N.I.H., Extramural
|
