Table 1.

Inclusion and exclusion criteria according to the PICOS.

Parameter	Inclusion Criteria	Exclusion Criteria
Population	SARS-CoV-2 positive patients—aged from 0 to 99 years, both genders	patients with other infectious diseases
Intervention	not applicable
Comparison	not applicable
Outcomes	determined the presence of oral manifestations, including oral lesions	determined only the presence of gastrointestinal manifestations, such as dysphagia
Study design	case-control, cohort and cross-sectional studies, case series with min. 10 patients	literature reviews, case reports, expert opinion, conference reports
	published between 2020 and 2022	not published in English