Table 1.

Inclusion and exclusion criteria of the main study

	Practice & practice personnel	Patients
Inclusion criteria	- Legal age - Ability to consent
	- Established, licensed physicians and assistants - Based in Baden-Wuerttemberg or North Rhine-Westphalia - Working computer system with internet connection - Patients physically visit the practice	- Insured with a statutory health insurer - GP-study: In T2DM-DMP in 4 of 5 past quarters - Dentist study: Need for systemic periodontitis therapy
Exclusion criteria	Persons who : - Live in a nursing home - Have a legal guardian - Are not of legal age - Are cognitively or linguistically incapable to participate
	- Are not licensed as physician - Don’t practice in Baden-Württemberg or North Rhine-Westphalia	- Are not insured with a German statutory health insurer (or not entitled to care that exceeds basic health care coverage) - GP-study: a periodontitis therapy in the past 12 months - Not in the T2DM-DMP in 4 of 5 past quarters - Dentist study: Previously diagnosed with diabetes