Periodontal diseases and potential risk factors in Egyptian adult population—Results from a national cross-sectional study. - Abou El Fadl, Reham Khaled; Abdel Fattah, Mona Ahmed; Helmi, Muhammad Ahmed; Wassel, Mariem Osama; Badran, Amira Saad; Elgendi, Huda Ahmed Amin; Allam, Mona Ezz Eldien; Mokhtar, Ahmed Gamal; Saad Eldin, Mostafa; Ibrahim, Eslam Ahmed Yahia; Elgarba, Bahaaeldeen M.; Mehlis, Mustafa (PLoS ONE, 2021)