[1] Stanford, Pediat, Stanford, CA USA
[2] Stanford, Radiat Oncol, Stanford, CA USA
[3] Nemours Alfred I duPont Hosp Children, Skeletal Dysplasia, Orthoped & BioMed, Wilmington, DE USA
[4] Georgia Inst Technol, Biomed Engn, Atlanta, GA 30332 USA
[5] Emory Univ, Atlanta, GA 30322 USA