aDepartment of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
bDepartment of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota, USA
cDepartment of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
dKaiser Permanente of Georgia, Atlanta, Georgia, USA
eThe Division of Endocrinology, Emory University, Atlanta, Georgia, USA
fSchool of Public Health, University of Texas Health Science Center at Houston, Houston, Texas, USA
Received 18 December, 2009
Revised 14 April, 2010
Accepted 25 May, 2010
Correspondence to Ryan Irvin, PhD, MS, 1665 University Blvd, Rm 230P, Birmingham, AL 35294, USA Tel: +1 205 975 7672; fax: +1 205 934 8665
