Ahmed, M.; Zahir, K. M.; Kayesh, A. J. M. E.; Khan, S. M. F. R.; Hosen, M. S.; Hossain, A.; Banna, M. H. Sufferings of Covid 19 Positive Patients Regarding Major Symptoms: A Prospective Observational Study. Med. res. chronicles 2021, 8, 295-302.