Foot Deformities, Congenital -- therapy : Principles and management of pediatric foot and ankle deformities and malformations / Vincent S Mosca, MD, Professor of Orthopedics, University of Washington School of Medicine, Pediatric Orthopedic Surgeon, Chief, Foot and Ankle Service, Director, Pediatric Orthopedic Fellowship, Former Director, Department of Orthopedics, Seattle Children's Hospital, Seattle, Washington