1. Department of Internal Medicine, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
2. Division of Medical Gastroenterology, Department of Internal Medicine, University of the Witwatersrand, Johannesburg, and Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
3. Department of Obstetrics and Gynaecology, University of the Witwatersrand, Johannesburg and Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
4. Division of Maternal and Fetal Medicine, Department of Obstetrics and Gynaecology, University of the Witwatersrand, Johannesburg, and Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
5. Department of Internal Medicine, University of the Witwatersrand, Johannesburg and Obstetric Internal Medicine Unit, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa