Sun 2008.

Methods	Two‐arm, single‐centre, parallel‐group RCT, with 12 months of follow‐up
Participants	Location: China Setting of recruitment and treatment: Shenzhen People's Hospital Sample size: Number randomised: 50 (25 in intervention group, 25 in comparison group) Number completed: 50 (25 in intervention group, 25 in comparison group) Participant (baseline) characteristics: Age: mean 40 years (18 to 49) Gender: 23 males and 27 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); complications 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