(i) Study design and sample
This was a cross-sectional analysis of pediatric hospitalizations (age <21 years) of patients with WAS using the Kids’ Inpatient Database (KID), prepared by the Agency for Healthcare Research and Quality (AHRQ) as part of the Healthcare Resource Utilization Project (HCUP)7,8,9. The KID database is a pediatric all-payer inpatient database of pediatric discharges at children’s hospitals, academic centers and community hospitals from 47 participating states. Since this study involves analysis of a publicly available de-identified data, it was exempt from Institutional Review Board review.