[1] Univ Texas Southwestern Med Ctr Dallas, Peter ODonnell Jr Sch Publ Hlth, 5323 Harry Hines Blvd, Dallas, TX 75390 USA
[2] Harold C Simmons Comprehens Canc Ctr, 2201 Inwood Rd, Dallas, TX 75235 USA
[3] Univ Washington, Dept Epidemiol, Box 351619,3980 15th Ave NE, Seattle, WA 98195 USA
[4] Kaiser Permanente Washington Hlth Res Inst, 1730 Minor Ave,Suite 1600, Seattle, WA 98101 USA
[5] Univ Washington, Sch Publ Hlth, Dept Hlth Syst & Populat Hlth, 3980 15th Ave NE,UW Box 351621, Seattle, WA 98195 USA
[6] Univ Chicago, Dept Publ Hlth Sci, Biol Sci, 5841 S Maryland Ave, Chicago, IL 60637 USA