1 Division of Plastic Surgery, University of California Davis Medical Center, 2221 Stockton Boulevard, Suite 2123, Sacramento, CA 95817, USA. Electronic address: llpu@ucdavis.edu.
2 Department of Plastic and Aesthetic Surgery, Dongguan Kanghua Hospital, 1000 Donguan Avenue, Dongguan, Guangdong Province, P.R. China 523080. Electronic address: chunmei22@hotmail.com.