1. M. Ahmad:
Department of Physiology, University of Karachi, Karachi -75270, Pakistan
2. R. Hasan:
Department of Physiology, University of Karachi, Karachi -75270, Pakistan
3. F. B. Taj:
Department of Physiology, University of Karachi, Karachi -75270, Pakistan
4. N. Ahmad:
New York Medical College Valhalla, New York, USA
5. S. Akhter:
Department of Physiology, University of Karachi, Karachi -75270, Pakistan