[1] Univ Utah, Spencer Fox Eccles Sch Med, Intermt Healthcare Dept Populat Hlth Sci, 295 Chipeta Way, Salt Lake City, UT 84108 USA
[2] Univ Utah Intermt Healthcare, Dept Populat Hlth Sci, Salt Lake City, UT USA
[3] Univ Utah, Dept Pediat, Div Cardiol, Salt Lake City, UT USA
[4] Salt Lake City VA Informat Decis Enhancement & Ana, Salt Lake City, UT USA
[5] UCL, Dept Appl Hlth Res, London, England
[6] Seattle Childrens Hosp, Div Pediat Cardiol, Seattle, WA USA
[7] Northwestern Univ, Feinberg Sch Med, Dept Prevent Med, Chicago, IL USA