Gatzoulis MA, Beghetti M, Galiè N, Granton J, Berger RM, Lauer A, Chiossi E, Landzberg M; BREATHE-5 Investigators. Longer-term bosentan therapy improves functional capacity in Eisenmenger syndrome: results of the BREATHE-5 open-label extension study. Int J Cardiol. 2008 Jun 23;127(1):27–32. doi: 10.1016/j.ijcard.2007.04.078. PMID: 17658633.