[1] Tufts Univ, Sch Med, Dept Pediat, Div Pediat Hosp Med, Boston, MA 02111 USA
[2] John A Burns Sch Med, Dept Pediat, Div Pediat Hosp Med, Honolulu, HI 96822 USA
[3] Barbara Bush Childrens Hosp, Maine Med Ctr, Dept Pediat, Div Pediat Hosp Med, Portland, ME USA
[4] Univ Arizona, Coll Med Phoenix, Phoenix Childrens Hosp, Phoenix, AZ USA
[5] Stanford Univ, Sch Med, Lucile Packard Childrens Hosp, Palo Alto, CA 94304 USA
[6] Dell Childrens Med Ctr Cent Texas, Austin, TX USA
[7] Michigan State Univ, Coll Osteopath Med, E Lansing, MI 48824 USA
[8] Drexel Univ, St Christophers Hosp Children, Coll Med, Philadelphia, PA 19104 USA
[9] Brown Univ, Warren Alpert Med Sch, Hasbro Childrens Hosp, Providence, RI 02912 USA