Anxiety 1 Article 1 COVID-19 1 Depression Frontline nurses 1 Hospital Anxiety and Depression Scale 1 PSQI 1 Perceived Stress Scale 1 Pittsburgh Sleep Quality Index 1 Sleep disturbance 1 Stress 1 adult 1 anxiety 1 awareness 1 chronic disease 1 coronavirus disease 2019 1 cross-sectional study 1 depression 1 disease assessment 1 female 1 human human experiment 1 male 1 mental health 1 middle aged 1 night sleep 1 normal human 1 nurse 1 pandemic 1 physiological stress 1