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Nor Adinar Baharuddin declares that she has no conflict of interest. Siew Wui Chan declares that she has no conflict of interest. Mohammad Tariqur Rahman declares that he has no conflict of interest. P. Mark Bartold declares that he has no conflict of interest. Sargunan Sockalingam declares that he has no conflict of interest. Rathna Devi Vaithilingam declares that she has no conflict of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"The questionnaire and methodology for this study were approved by the Medical Ethics Committee, Faculty of Dentistry, University of Malaya (DF RD1707\/0029(L) and the Medical Research Ethics Committee, University Malaya Medical Centre (MRECID NO: 2017510\u20135227).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Informed consent was obtained from all individual participants included in the study.Patients signed informed consent regarding publishing their data.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Statement of informed consent"}}]}}