1. Netcare Sunninghill and Sunward Park Hospitals, Division of Cardiology, Charlotte Maxeke Johannesburg Academic Hospital, South Africa;
2. Division of Nephrology and Hypertension, Groote Schuur Hospital, South Africa;
3. Mediclinic Panorama, South Africa;
4. Netcare Alberton Hospital, South Africa;
5. Mediclinic Heart Hospital, South Africa;
6. Life Healthcare, South Africa;
7. Division of Endocrinology, Chris Hani Baragwanath Academic Hospital, University of Witwatersrand, South Africa;
8. Houghton House Addiction & Mental Health Treatment Centres, South Africa