Oral mucosal lesions associated with betel quid, areca nut and tobacco chewing habits: consensus from a workshop held in Kuala Lumpur, Malaysia, November 25-27, 1996. di Zain, R.B., Ikeda, N., Gupta, P.C., Warnakulasuriya, S., van Wyk, C.W., Shrestha, P., Axéll, T.