Zhang 2007.

Methods	Randomised controlled trial
Participants	Patients with paroxysmal AF were included. 63 patients were randomised. 30 patients were assigned to CPVA plus PVI group, and 33 to CPVA alone group. Age: 64+/‐10 years in CPVA plus PVI group, and 62+/‐14 years in CPVA alone group. % of male: 19/30 (63%) in CPVA plus PVI group, and 20/30 (67%) in CPVA alone group. Follow‐up: 11+/‐3 months. Location: Shanghai, China.
Interventions	CPVA plus PVI compared with CPVA alone.
Outcomes	Sinus rhythm restored, recurrence of AF
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient detail was provided.
Allocation concealment (selection bias)	Unclear risk	B‐Unclear. The authors did not depict allocation concealment method.
Blinding	High risk	Blinding was not reported.
Incomplete outcome data addressed	High risk	There were no patients withdrawn or lost to follow up.
Adequate sequence generation	Unclear risk	It was not addressed.