[1] Univ Chicago, Dept Med, Sect Hosp Med, 5841 S Maryland Ave, Chicago, IL 60637 USA
[2] Univ Chicago, Med Ctr, Div Hosp Med, Chicago, IL 60637 USA
[3] Univ Kansas, Med Ctr, Dept Med, Div Pulm Crit Care & Sleep Med, Kansas City, KS 66103 USA
[4] Kansas City Univ, Coll Osteopath Med, Kansas City, MO USA
[5] Univ Chicago, Dept Med, Sect Gen Internal Med, 5841 S Maryland Ave, Chicago, IL 60637 USA
[6] Advocate Lutheran Gen Hosp, Park Ridge, IL USA