Fig. 2From: Does smoking cessation affect postoperative healing following oral surgery among smokers? – a systematic reviewMethodological assessment of the remaining articles after full text assessment (n = 4) with the risk of bias in non-randomized studies of interventions (ROBINS-I) tool. One study was estimated to have a moderate risk of overall bias and was included. Three studies [15,16,17] were removed without further review because the risk of confounding bias was considered criticalBack to article page