1. Pulmonology Unit, Department of Medicine, Ahmadu Bello University Teaching Hospital, PMB 06, Shika, Zaria, Nigeria
2. Department of Chemical Pathology, Ahmadu Bello University Teaching Hospital, PMB 06, Shika, Zaria, Nigeria
3. Department of Histopathology, Ahmadu Bello University Teaching Hospital, PMB 06, Shika, Zaria, Nigeria
4. Department of Surgery, Ahmadu Bello University Teaching Hospital, PMB 06, Shika, Zaria, Nigeria
5. Endocrine Unit, Department of Medicine, Ahmadu Bello University Teaching Hospital, PMB 06, Shika, Zaria, Nigeria