42. Congenital Upper Extremity Defects: USA National Incidence and Risk Factors. (26th April 2023) - Brydges, Hilliard T.; Cassidy, Michael F.; Chaya, Bachar F.; Tran, David L.; Onuh, Ogechukwu C.; Laspro, Matteo; Celestin, Arthur R.; Sharma, Sheel