[1] Univ Texas MD Anderson Canc Ctr, Dept Hlth Serv Res, 1515 Holcombe Blvd,Unit 1444, Houston, TX 77030 USA
[2] Natl Databank Rheumat Dis, FORWARD, Wichita, KS USA
[3] Univ Nebraska Med Ctr, Dept Internal Med, Omaha, NE USA
[4] Univ Texas MD Anderson Canc Ctr, Dept Behav Sci, Houston, TX USA
[5] Univ Texas MD Anderson Canc Ctr, Dept Gen Internal Med, Sect Rheumatol & Clin Immunol, Houston, TX 77030 USA