1. Department of Neurosurgery, Rawalpindi Medical College, HFH, Rawalpindi, Pakistan
2. Department of Neurosurgery, University Klinic Eppendorf, Martinistrasse, Hamburg, Germany
3. Department of Endocrinology, Clinic of Internal Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
4. Pituitary Unit, Clinic of Neurosurgery, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany