[1] Mayo Clin, Div Pulm & Crit Care Med, Rochester, MN USA
[2] Inova Heart & Vasc Inst, Falls Church, VA USA
[3] Duke Univ, Sch Med, Dept Populat Hlth Sci, Durham, NC USA
[4] Univ Calif San Francisco, San Francisco Med Ctr, Div Pulm Crit Care Allergy & Sleep Med, San Francisco, CA USA
[5] Johns Hopkins Univ, Sch Med, Div Pulm & Crit Care Med, Baltimore, MD USA
[6] Global Med Affairs, United Therapeut, Durham, NC USA
[7] RTI Hlth Solut, Patient Ctr Outcomes Assessment, Durham, NC USA
[8] RTI Hlth Solut, Patient Ctr Outcomes Assessment, Ann Arbor, MI USA