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K.C.: Research grants from Actelion, Bayer, Geon, Gilead, GlaxoSmithKline, NIH, Novartis, United Therapeutics; honoraria from Actelion, Bayer, Gilead. F.T.: Research grants from Akaria, Bayer, Geon, Gilead, Medtronic; consultant\/advisory board with Actelion, Bayer, Gilead, LungLLC, Novartis, United Therapeutics. S.M.: Research grants from ACC\/GE Healthcare Career Development Award, National Center for Advancing Translational Sciences, NIH, UT-STAR.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"All procedures involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of retrospective study formal consent is not required.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}]}}