[1] Texas Childrens Hosp, Baylor Coll Med, EB Singleton Dept Radiol, Houston, TX 77030 USA
[2] Texas Childrens Hosp, Baylor Coll Med, Dept Pediat, Houston, TX 77030 USA
[3] Texas Childrens Hosp, Baylor Coll Med, Outcomes & Impact Serv, Houston, TX 77030 USA
[4] Stanford Univ, Dept Radiol, 725 Welch Rd, Palo Alto, CA 94304 USA