1. Department of Respiratory MedicineQueen Elizabeth University HospitalGlasgowUK
2. Scottish Pulmonary Vascular UnitGolden Jubilee National HospitalGlasgowUK
3. Department of BiomedicalChemical and Materials EngineeringSan Jose State UniversitySan JoseCAUSA
4. Glasgow Clinical Research Imaging FacilityQueen Elizabeth University HospitalGlasgowU.K.
5. Department of Biomedical EngineeringUniversity of Wisconsin‐MadisonMadisonWIUSA