[1] Kettering General Hospital,Respiratory Division
[2] Michigan State University,Department of Epidemiology, College of Human Medicine
[3] Aga Khan University Hospital,Department of Community Health Sciences
[4] University of Texas School of Public Health,Division of Epidemiology and Biostatistics
[5] University of Texas Health Science Center,Biostatistics/Epidemiology/Research Design and Analysis Core, Center for Clinical and Translational Sciences
[6] Kettering General Hospital,undefined