Awake Prone Positioning for Non-intubated COVID-19 Patients

Patients randomized to this arm will receive self-prone positioning. Each patient in the intervention group will be helped into the prone position and encouraged to stay in the prone position as long as tolerated (at least 1 hour). The prone positioning consists of placing the patient on his or her stomach with the head on the side. Self-prone position will be performed 45 minutes up to 1 hour after meals to avoid gastrointestinal side effects. The patient will be maintained in prone position until the patient becomes too tired and uncomfortable to keep that position. If patients will asked to regain the supine position before the 1 hour period was complete, patient's prone position will be considered unfeasible and the reason will be reported. Patients who required invasive mechanical ventilation at any time point will be intubated and excluded from the study.