Introduction
The 4th World Symposium on Pulmonary Hypertension

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Dr. Humbert has received honoraria and research grants from Actelion, Bayer Schering, GlaxoSmithKline, Novartis, Pfizer, and United Therapeutics. Dr. McLaughlin has received honoraria and/or consulting fees from Actelion, Gilead, MondoBIOTECH, and United Therapeutics. The University of Michigan has received research grants from Actelion, Pfizer, and United Therapeutics.