49 Recent studies have signified the impact of online teaching and learning in some medical conditions such as headache, eye strain, computer vision syndrome (CVS), neck pain and sleep disturbances reporting a highly significant correlation with online class duration of more than 4 hours, each class is more than 40 minutes and associated pre-existing medical issues. 50 , 51 Moreover, pandemic-related stress or anxiety were also considered as a challenge reported by a considerable number of students (48%). 40 , 42 , 52 Anxi
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Medical Students' Perceptions Towards Online Teaching During the Covid-19 Pandemic: A Cross-Sectional Study from Saudi Arabia.
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