Effect of Health Preventive Program toward COVID-19 on Knowledge, Perceptions, and Practices among Older Adults Research Authors Zakia T. Toama. (1), Ola Gouda Mohamed Elshiekh (2), Ola Ezzat Eltohamy Mohamed(2) , Nermeen Mahmoud Abd El-Aziz (3) Research Member Nermeen Mahmoud Abdel-Aziz Barakat Research Year 2021
