1. Surgical Neurology BranchNational Institute of Neurological Disorders and Stroke, National Institutes of HealthBethesdaMarylandUSA
2. Program in Reproductive and Adult EndocrinologyEunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of HealthBethesdaMarylandUSA
3. Department of UrologySchool of MedicineComenius UniversityBratislavaSlovakia