1. Department of Burn & Plastic Surgery, Provincial Hospital Affiliated to Shandong University, Ji'nan 250021, Shandong Province, PR China
2. Department of Burn & Plastic Surgery, Zhangqiu People's Hospital, Ji'nan 250200, Shandong Province, PR China
3. Department of Obstetrics, Ji'nan Maternity & Child Health Care Hospital, Ji'nan 250001, Shandong Province, PR China