Preoperative preparation
Hemifacial Microsomia, Upper lip bite
All children were forbidden to drink for 6 h and fasted for 8 h before operation. The general information of the patients were asked before surgery, including age, height and weight. The modified Mallampati classification (Class I–IV), mouth opening, thyromental distance, Upper lip bite test class, Hemifacial Microsomia, Modified Mallampati (Samsoon and Young) classification [