Wang 2008.

Methods	Computer‐generated randomisation
Participants	106 drug‐refractory paroxysmal AF patients aged 66 +/‐8.8 years were enrolled. 54 patients were assigned to CPVI group, and 52 to CPVI + SVCI group. Age: 66.6+/‐8.8 years in CPVI group, and 65.4+/‐8.9 years in CPVI+SVCI group. % of male: 28/54 (52%) in CPVI group, and 30/52 (58%) in CPVI+SVCI group. Follow‐up: 12 months. Location: Shanghai, China.
Interventions	CPVI plus SVCI compared with CPVI.
Outcomes	AF‐free survival, recurrence of AT, complications.
Notes	SVCI: superior vena cava isolation.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer‐generated randomisation.
Allocation concealment (selection bias)	Low risk	A‐Yes. Sequence was generated by computer, which was better in allocation concealment.
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Incomplete outcome data addressed	High risk	There were no patients withdrawn or lost to follow up.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	Low risk	Sequence was generated by computer program