1 Department of Oral and Maxillofacial Surgery, Oral Medicine and Periodontology, Faculty of Dentistry, The University of Jordan, Amman, PO Box 11942, Jordan. yazan_hasoneh@yahoo.com.
2 WHO Collaborating Centre for Oral Health-General Health, University College London, London, UK.
3 Department of Physiology and Biochemistry, Faculty of Medicine, The University of Jordan, Amman, Jordan.
4 Department of Oral and Maxillofacial Surgery, Oral Medicine and Periodontology, Faculty of Dentistry, The University of Jordan, Amman, PO Box 11942, Jordan.
5 Department of Dentistry, The University of Jordan Hospital, Amman, Jordan.