Are There Betel Quid Mixtures Less Harmful than Others? A Scoping Review of the Association between Different Betel Quid Ingredients and the Risk of Oral Submucous Fibrosis oleh Nicola Cirillo, Peter Hung Duong, Wee Teng Er, Casey Thao Nhi Do, Manikkuwadura Eranda Harshan De Silva, Yining Dong, Sok Ching Cheong, Elizabeth Fitriana Sari, Michael J. McCullough, Pangzhen Zhang, Stephen S. Prime