Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Kaplan-Meier curves of long term prostacyclin treatment in children with pulmonary hypertension at The Children's Hospital Heart Institute/Paediatric Heart Lung Center, Denver, Colorado. PPH, primary pulmonary hypertension; CHD, congenital heart disease; CLD, chronic lung disease; Liver, liver disease; CTD, connective tissue disease.
