作者单位:
VA Boston Healthcare System, 150 S Huntington Ave, Boston, MA 02130, United States
[1]
Leonard and Madlyn Abramson Cancer Center, University of Pennsylvania, Philadelphia, PA, United
[2]
Center for Outcomes Research, Children's Hospital of Philadelphia, Philadelphia, PA, United States
[3]
Department of Statistics, University of Pennsylvania, Philadelphia, PA, United States
[4]
发布时间
2014-03-07