1 Division of Plastic and Reconstructive Surgery, Keck School of Medicine, University of Southern California, 1510 San Pablo St, Suite 415, Los Angeles, CA, 90033, USA. Eric.nagengast@med.usc.edu.
2 Division of Plastic and Maxillofacial Surgery, Children's Hospital of Los Angeles, 4650 Sunset Blvd, Los Angeles, CA, 90027, USA. Eric.nagengast@med.usc.edu.
3 Operation Smile Inc., 3641 Faculty Boulevard, Virginia Beach, VA, 23453, USA. Eric.nagengast@med.usc.edu.
4 Division of Plastic and Reconstructive Surgery, Keck School of Medicine, University of Southern California, 1510 San Pablo St, Suite 415, Los Angeles, CA, 90033, USA.
5 Division of Plastic and Maxillofacial Surgery, Children's Hospital of Los Angeles, 4650 Sunset Blvd, Los Angeles, CA, 90027, USA.
6 Operation Smile Inc., 3641 Faculty Boulevard, Virginia Beach, VA, 23453, USA.
7 Department of Preventive Medicine, Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA.
8 Division of Plastic and Reconstructive Surgery, Shriners Hospital for Children, 909 S Fair Oaks Ave, Pasadena, CA, 91105, USA.
9 Department of Plastic and Maxillofacial Surgery, Royal Children's Hospital, Flemington Rd, Melbourne, Australia.