1. Laboratory of Developmental Genetics; Institute of Experimental Endocrinology; Biomedical Research Center; Slovak Academy of Sciences; Bratislava Slovakia
2. Department of Genetics; Comenius University; Bratislava Slovakia
3. Institute of Biology and Medical Genetics; 1st Faculty of Medicine; Charles University; Prague Czech Republic
4. Department of Normal, Pathological and Clinical Physiology; Third Faculty of Medicine; Charles University; Prague Czech Republic
5. Department of Biology; University of Nebraska; Omaha Nebraska