Table 1.

PICOS inclusion and exclusion criteria.

Parameter	Inclusion Criteria	Exclusion Criteria
Population	GP or other related professionals performing the same profession; e.g Primary care physician (PCP) or physicians operating in a Primary care center.	Healthcare professionals different from GPs (or other related professionals performing the same profession).
Intervention	Involvement of GPs in vaccination campaign	Interventions in pediatric patients, interventions aimed to investigate GPs’ knowledge toward vaccination
Comparator	None	None
Outcome	Vaccine uptake and acceptance in GP’s patient population	Another outcome
Study design	Experimental, quasi-experimental or observational study with original primary data and full-text studies written in English	Study Protocol or other papers not presenting original data (e.g., reviews, letters to editors, trial registrations, proposals for protocols, editorials, book chapters, conference abstracts).