[1] Merck & Co Inc, Global Hlth Outcomes, West Point, PA 19486 USA
[2] Indiana Univ, Sch Med, Dept Pediat, Sect Adolescent Med, Indianapolis, IN 46202 USA
[3] Columbia Univ, Dept Pediat, Med Ctr, New York, NY 10027 USA
[4] i3 Innovus, Eden Prairie, MN USA
[5] Amer Acad Pediat, Elk Grove Village, IL USA
[6] Univ Rochester, Dept Pediat, Rochester, NY USA