https://nesslabs.com/wp-content/uploads/2020/07/mental-models-validity-reliability.png
https://i0.wp.com/xpslibrary.com/wp-content/uploads/2019/07/Accuracyvs.PrecisionABCDHighAccuracyHighPrecision.jpg?resize=768%2C576&ssl=1
==Tips in Case-control design==