endotracheal intubation human 8 female 6 male 6 Humans 5 adult 4 procedures 4 respiration control 4 Airway Management 3 Article 3 Intubation, Intratracheal 3 Male 3 article 3 case report 3 controlled study 3 laryngoscopy 3 major clinical study 3 Aged 2 Airway management 2 COVID-19 2 Female 2 Laryngoscopy 2 SARS-CoV-2 2 adverse event 2 aged 2 artificial ventilation 2 clinical article 2 cohort analysis 2 coronavirus disease 2019 2 disease severity 2