1 Division of Pulmonology, Department of Medicine, Faculty of Health Sciences, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa.
2 Mediclinic Hospital-Abu Dhabi, United Arab Emirates.
3 Division of Radiology, Faculty of Health Sciences, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa.
4 Chris Barnard Division of Cardiothoracic Surgery, Faculty of Health Sciences, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa.