1. Department of MedicineDivision of Pulmonary and Critical Care MedicineUniversity of Maryland School of MedicineBaltimoreMarylandUSA
2. Department of Internal MedicineWake Forest University Health SciencesWinston‐SalemNorth CarolinaUSA
3. Department of MedicineCenter for Translational MedicineJane and Leonard Korman Lung CenterThomas Jefferson UniversityPhiladelphiaPennsylvaniaUSA
4. Department of MedicineUniversity of Pennsylvania School of MedicinePhiladelphiaPennsylvaniaUSA