1. Department of Pediatric Orthopedics and Traumatology Medical University of Bialystok, Bialystok, Poland
2. Medical Institute of the State College of Computer Science and Business Administration, Łomża, Poland
3. International Science & Health Foundation, Krakow, Poland
4. American Medical Holdings Inc., Staten Island, New York
5. Creighton University Medical Center, Omaha, Nebraska