Studying the Effect of Long COVID-19 Infection on Sleep Quality Using Wearable Health Devices: Observational Study - Mario Mekhael; Chan Ho Lim; Abdel Hadi El Hajjar; Charbel Noujaim; Christopher Pottle; Noor Makan; Lilas Dagher; Yichi Zhang; Nour Chouman; Dan L Li; Tarek Ayoub; Nassir Marrouche (Journal of Medical Internet Research, 2022)