TROLLEY Leadership Clinical Coordinating Center Christopher Almond, MD, MPH Grant Co-PI & Trial Co-Chair Stanford University Caroline Ozment , MD Grant Co-PI and Trial Co-Chair Duke University Selena Gonzales, MPH CCC Project Manager Stanford University Data & Statistical Coordinating Center Lynn Sleeper, ScD Grant Co-PI & DCC PI Boston Children’s Hospital Ravi Thiagarajan, MBBS, MPH Medical Monitor Boston Children’s Hospital Krislyn Boggs, MPH DCC Project Manager Boston Children’s Hospital Site Principal Investigators Sirine Baltagi, MD UT Southwestern Eva Cheung, MD Columbia University Michael McMullan, MD Seattle Children’s Hospital Caroline Ozment, MD Duke University Kathleen Ryan, MD Stanford University