Author Attila Jakab is currently working as a full professor and deputy chief at the Department of Obstetrics and Gynecology, at the University of Debrecen. He received his M.D. from the University of Debrecen in 1989. He is a specialist in Ob/gyn and Endocrinology. From 2001 to 2002, he was a post-doctor at Yale University. His research areas include reproductive endocrinology, sperm physiology, infertility; gynecologic ultrasound; and early pregnancy. He has good competencies in endocrinology and metabolic diseases obstetrics and gynecology.