[1] Univ Peradeniya, Dept Oral Med & Periodontol, Peradeniya, Sri Lanka
[2] Teesside Univ, Sch Hlth & Life Sci, Middlesbrough, England
[3] Univ Puthisastra, Fac Dent, Phnom Penh, Cambodia
[4] Cephas Hlth Res Initiat Inc, Ibadan, Nigeria
[5] Univ Coll Hosp, Dept Oral & Maxillofacial Surg, Ibadan, Nigeria
[6] Usmanu Danfodiyo Univ, Dept Sociol, Sokoto, Nigeria
[7] Univ Johannesburg, Dept Sociol, Johannesburg, South Africa