1. National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA, USA
2. Department of Pediatrics, Division of Medical Genetics, University of Utah, Salt Lake City, UT, USA
3. Orthopedics, Department of Clinical Sciences, Skåne University Hospital, Lund University, Lund, Sweden
4. Department of Pediatrics, University of Arizona, Tucson, AZ, USA