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Table 2 Etiology

From: Reconstructive management of the rare bilateral oral submucos fibrosis using nasolabial flap in comparison with free radial forearm flap - a randomised prospective trial

Factors n Average duration Smoking
Betel quid chewing 44 20 29
Betel nut chewing 5 15 1
Betel quid and betel nut chewing 1 10 0