1Department of Medicine, Bayero University, PO Box 4445, Kano, Nigeria
2Department of Medicine, Aminu Kano Teaching Hospital, Kano, Nigeria
3Department of Public Health and Clinical Medicine, Umea University, Umeå, Sweden
4Department of Medicine, Murtala Mohammed Specialist Hospital, Kano, Nigeria
5Department of Medicine, Muhammad Abdullahi Wase Specialist Hospital, Kano, Nigeria
6Department of Obstetrics and Gynaecology, Bayero University and Aminu Kano Teaching Hospital, Kano, Nigeria
7Department of Chemical Pathology, Bayero University and Aminu Kano Teaching Hospital, Kano, Nigeria
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