[1] Univ Malaya, Fac Dent, Dept Oral Pathol Oral Med & Periodontol, Kuala Lumpur, Malaysia
[2] Univ Malaya, Oral Canc Res & Coordinating Ctr, Kuala Lumpur, Malaysia
[3] Canc Res Initiat Fdn CARIF, Sime Darby Med Ctr, Oral Canc Team, Subang Jaya, Malaysia
[4] Univ Malaya, Fac Dent, Dept Oral Maxillofacial Surg, Kuala Lumpur, Malaysia
[5] Sengen Sdn Bhd, Petaling Jaya, Selangor, Malaysia
[6] Univ Malaya, Dept Ear Nose & Throat, Fac Med, Kuala Lumpur, Malaysia
[7] Univ Malaya, CRYSTAL, Kuala Lumpur, Malaysia