Selection

Comparability

Exposure

Study

Is the case definition adequate?

Representativeness of the cases

Selection of Controls

Definition of Controls

Comparability of cases and controls based on the design or analysis

Ascertainment of exposure

Same method of ascertainment for cases and controls

Non-Response rate

Total score

Agreement (%)

Risk of Bias

Stadelmaier et al. 2017 [11]

*

*

*

*

*

*

*

7

85%

Low