1. Department of Plastic and Reconstructive Surgery; Xijing Hospital; Fourth Military Medical University; Xi'an 710032 China
2. Department of Burn and Plastic Surgery; The 253rd Hospital of PLA; Hohhot Inner Mongolia 010051 China
3. Department of Otolaryngology-Head and Neck Surgery; The Fourth People's Hospital of Shaanxi Province; Xi'an 710043 China
4. Department of Otolaryngology-Head and Neck Surgery; Xijing Hospital; Fourth Military Medical University; Xi'an 710032 China