[1] Univ Michigan, Dept Internal Med, Ann Arbor, MI USA
[2] VA Ann Arbor Healthcare Syst, Ctr Clin Management Res, Ann Arbor, MI USA
[3] Univ Michigan, Ctr Stat Consultat & Res, Ann Arbor, MI USA
[4] UNMC, Omaha, NE USA
[5] Univ Nebraska Med Ctr, Div Rheumatol, Omaha, NE USA
[6] Univ Michigan, Dept Anesthesia, Ann Arbor, MI USA
[7] Univ Penn, Philadelphia, PA USA
[8] Univ Utah, Salt Lake City VA, Salt Lake City, UT USA
[9] Retired, Salt Lake City, UT USA