1. Menopause Clinic, Second Department of Obstetrics and Gynecology, Aretaieio Hospital, University of Athens, Athens, Greece
2. Royal Free Hospital, NHS Foundation Trust, University College London Medical School, London, UK
3. Escuela de Posgrado en Salud, Universidad Espíritu Santo, Samborondón, Ecuador
4. Biochemical Laboratory, Aretaieio Hospital, University of Athens, Athens, Greece