[1] Duke Univ, Duke Clin Res Inst, Durham, NC USA
[2] Stormont Vail Hlth, Topeka, KS USA
[3] Mem Hosp South Bend, South Bend, IN USA
[4] Ascens Sacred Heart Hosp, Pensacola, FL USA
[5] North Cent Baptist Hosp, San Antonio, TX USA
[6] Swedish First Hill Hosp, Seattle, WA USA
[7] Womans Hosp Texas, Houston, TX USA
[8] St Lukes Hlth Syst, Kansas City, MO USA
[9] HCA Houston Healthcare, Houston, TX USA
[10] Methodist Hosp San Antonio, San Antonio, TX USA
[11] HCA Houston Healthcare Clearlake, Webster, TX USA
[12] St Davids Med Ctr, Austin, TX USA
[13] Providence Alaska Med Ctr, Anchorage, AK USA
[14] Inova Hlth Syst, Alexandria, VA USA
[15] St Lukes Baptist Hosp, San Antonio, TX USA
[16] St Josephs Womens Hosp, Tampa, FL USA
[17] St Joseph Med Ctr, Houston, TX USA
[18] MEDNAX Ctr Res Educ Qual & Safety, Sunrise, FL USA
[19] Northwestern Univ, Feinberg Sch Med, Chicago, IL USA
[20] Duke Clin Res Inst, 300 W Morgan St, Durham, NC 27701 USA