Xue 2010.

Methods	Two‐arm, single‐centre, parallel‐group RCT, with 12 to 18 months of follow‐up
Participants	Location: China Setting of recruitment and treatment: the Affiliated Hospital of Medical College Qingdao University Sample size: Number randomised: 256 (148 in intervention group, 108 in comparison group) Number completed: 256 (148 in intervention group, 108 in comparison group) Participant (baseline) characteristics: Age: mean 45.6 years (20 to 70) Gender: 140 males and 116 females Types of parotidectomy: superficial parotidectomy Thickness of skin flap: not stated Inclusion criteria: benign lesions of the parotid gland; aged over 18 years Exclusion criteria: not stated
Interventions	Intervention group (flap group): superficial parotidectomy + acellular dermal matrix Comparator group (no flap group): superficial parotidectomy Use of additional interventions: not stated
Outcomes	Primary outcome: incidence rate of Frey's syndrome assessed clinically (Minor's starch‐iodine test) (assessed at 1 year after surgery) Secondary outcomes: incidence rate of Frey's syndrome assessed by participants (assessed at 1 year after surgery)
Notes	We could not make contact with the authors to confirm whether randomisation was strictly performed