1. Department of Orthopaedics, King Saud University, Riyadh, Saudi Arabia,
2. Department of Obstetrics and Gynaecology, Division of Obstetrics and Feto-Maternal Medicine, Medical University of Vienna, Vienna, Austria, and
3. Department of Pediatric Orthopaedics and Adult Foot and Ankle Surgery, Orthopaedic Hospital Speising, Vienna, Austria