1 Department of Medicine, Imperial College London, London W2 1NY, UK; Department of Metabolism, Digestion and Reproduction, Imperial College London, London W2 1NY, UK. Electronic address: j.kim@doctors.org.uk.
2 Department of Metabolism, Digestion and Reproduction, Imperial College London, London W2 1NY, UK.
3 Department of Psychiatry, Muhimbili University of Health and Allied Sciences, Muhimbili National Hospital, Dar es Salaam, Tanzania.
4 Department of Hepatology and Gastroenterology, Muhimbili National Hospital, Dar es Salaam, Tanzania.