Contact us To learn more or become a participant, please contact your local study site. Researcher inquries about the study may contact Selena.Gonzales@stanford.edu or Krislyn.Boggs@cardio.chboston.org. Study site locationsUT Southwestern: Sirine Baltagi, MDEmail: Sirine.Baltagi@UTSouthwestern.eduColumbia University: Eva Cheung, MDEmail: ec2335@cumc.columbia.eduSeattle Children’s Hospital: Michael McMullan, MDEmail: michael.mcmullan@seattlechildrens.orgDuke University: Caroline Ozment, MDEmail: caroline.ozment@duke.eduStanford University/Lucile Packard Children's Hospital: Kathleen Ryan, MDEmail: kateryan@stanford.edu