Table 4.

Overview over DZHK quality levels

	DZHK quality levels
Implementation
Level 1	The examination is performed in accordance with the requirements laid down in clinical guidelines (state-of-the-art), which is documented as level 1 in DZHK SOPs
Level 2	The examination is performed in accordance with more sophisticated requirements above state-of-the-art. The minimum requirements for ensuring the quality of the implementation and of the examiner are defined in DZHK level 2 SOPs
Level 3	The examination is performed in accordance with detailed requirements including certification of the examiner: determination of intra- and inter-observer variability (standard of epidemiological studies) as defined in DZHK level 3 SOPs