Table 1. PCC (Population, Concept, Context).

P	Diabetes mellitus type 2 or gestation diabetes	Type 2 diabetes mellitus
		Gestational diabetes mellitus
		People at risk of developing diabetes mellitus or gestational diabetes mellitus
	Vulnerable patients/-groups	Elderly, older people, seniors > 65 years
		Disabled people
		People in need of care, residents of a nursing home
		Unemployed people
		Refugees/migrants as well as ethnic groups (e.g. African Americans or Hispanics)
		Homeless people
		Drug/substance abusers (excluding nicotine abuse/smoking)
		Low socio-economic status
C	Prevention	Primary/ secondary/ tertiary prevention
	Barriers and facilitating factors	Definition of barriers and motivating aspects e.g. language, costs, religion, ethnic background, low income, social and health support
		Solutions to exploit barriers and support solutions e.g. materials and manpower, use of media, insurance
C	>2008; WHO stratum A
Other	all types of studies; all languages; available in full text version

The PPC (Population, Concept, Context) mnemonic illustrates the eligibility criteria for the scoping review. Additionally to the classic PPC mnemonic there are other criteria regarding study types, languages and the availability of the full text version.