[1] Baylor Coll Med, Houston, TX 77030 USA
[2] Univ Rochester, Sch Med & Dent, Rochester, NY USA
[3] Louisiana State Univ, Hlth Sci Ctr, Shreveport, LA 71105 USA
[4] Univ Arizona, Coll Med, Phoenix, AZ USA
[5] Univ N Carolina, Sch Med, Chapel Hill, NC USA
[6] Univ Washington, Sch Med, Seattle, WA USA
[7] Minnesota Dept Hlth, St Paul, MN USA
[8] Howard Univ, Coll Med, Washington, DC 20059 USA
[9] Harbor UCLA Med Ctr, Torrance, CA 90509 USA
[10] Tufts Med Ctr, Boston, MA USA
[11] George Washington Univ, Washington, DC USA
[12] UCSD Sch Med, San Diego, CA USA
[13] Rady Childrens Hosp San Diego, San Diego, CA USA
[14] Univ Wisconsin, Sch Med & Publ Hlth, Madison, WI USA
[15] Yale Univ, Sch Med, New Haven, CT USA