Variation in the use of pulmonary vasodilators in children and adolescents with pulmonary hypertension: a study using data from the MarketScan® insurance claims database.

"Conflict of interest Dr Michael L. O’Byrne has received honoraria from Gore Medical (Newark, Delaware). There are no other conflicts of interest to disclose."

"Funding Dr Michael L. O’Byrne received support from the National Institute of Health/National Heart Lung and Blood Institute (K23 HL130420-01) and the Pulmonary Hypertension Association Robyn Barst Grant. Dr Catherine M. Avitabile receives support from the Pediatric Heart Network and is the recipient of an Entelligence Young Investigator Grant. Dr David B. Frank receives support from the National Institute of Health/National Heart, Lung, and Blood Institute (K08-HL140129, the Parker B. Francis Foundation, and the W.W. Smith Charitable Trust. This project received support from the CHOP Pulmonary Hypertension Research Fund. The funding agencies had no role in the planning or execution of the study, nor did they edit the manuscript. The manuscript represents the opinions of the authors alone."