Nader M. Elsayed Marei, Mohamed Tharwat Salama, and Mohammed Ali Habibullah, “KNOWLEDGE, ATTITUDE AND PRACTICE OF HAND HYGIENE AMONG DENTISTS AS A PREVENTION METHOD FROM COVID-19 IN AL QASSIM REGION, KINGDOM OF SAUDI ARABIA: A CROSS-SECTIONAL STUDY”., ijmsdr, vol. 4, no. 9, Sep. 2020.