Correction to: Outcomes of idiopathic pulmonary arterial hypertension in Japanese children: a retrospective cohort study (Heart and Vessels, (2021), 36, 9, (1392-1399), 10.1007/s00380-021-01806-1)

In the original publication of the article, under the abstract, the following sentence “Ninety-five patients were finally enrolled.” was published incorrectly. The correct sentence should read as “Ninety-one patients were finally enrolled.”. In addition, under the abstract, the result, and the figure legend for Figure 1, the percentage of Kaplan–Meier survival estimate, was published incorrectly as “The overall 1, 3, 5, and 10-year event free rate, estimated using Kaplan–Meier survival estimate, was 96, 91, 83, and 74%, respectively.”. The correct value should read as follows “The overall 1, 3, 5, and 10-year event free rate, estimated using Kaplan–Meier survival estimate, was 96, 89, 86, and 77%, respectively.”.