1 Faculty of Health Sciences, The University of Bamenda, Bamenda, Cameroon; Department of Nephrology, Yaounde General Hospital, Yaounde, Cameroon.
2 Department of Paediatrics and Child Health, University of Cape Town, Cape Town, South Africa; Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA. Electronic address: valerie.luyckx@uzh.ch.
3 Department of Internal Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
4 Global Health Institute, King's College London, London, UK.