[1] Univ Alabama Birmingham, Sch Med, Birmingham, AL USA
[2] Univ Alabama Birmingham, Sch Publ Hlth, Birmingham, AL USA
[3] Univ Chicago Med, Comer Childrens Hosp, Chicago, IL USA
[4] Univ Chicago Med, Pritzker Sch Med Chicago, Chicago, IL USA
[5] Wayne State Univ, Sch Med, Detroit, MI USA
[6] Mayo Clin, Rochester, MN USA
[7] West Virginia Sch Med, Morgantown, WV 26506 USA
[8] Univ Alabama Birmingham, Dept Urol, Birmingham, AL USA