I. El-Sayed

Effects of Pre-Existing Mental Conditions on Fatigue and Psychological Symptoms Post-COVID-19

S. Steffens, S. Heinemann, C. Happle, 2022, International journal of environmental research and public health.

Comparison of four sleep questionnaires for screening obstructive sleep apnea

I. El-Sayed, Iman El-Sayed, 2012 .