1. Resident of Postgraduate Program in Periodontics, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Indonesia.
2. Department of Periodontology, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Indonesia.
3. Department of Biomedical Sciences, Faculty of Dentistry, Universitas Jember, Jember, Indonesia.