1. Latvian Biomedical Research and Study Centre, Ratsupites Street 1 k-1, Riga LV-1067, Latvia
2. Clinic of Neurosurgery, Pauls Stradins Clinical University Hospital, 13 Pilsonu Street, Riga LV-1002, Latvia
3. Centre of Endocrinology, Pauls Stradins Clinical University Hospital, 13 Pilsonu Street, Riga LV-1002, Latvia