In relation to screening programs, match the term on the left with the definition on the right:
1) Selection bias: Individuals that participate in screening programs may be generally healthier and have a different probability of disease than those who do not participate
2) Length bias: Cases detected by a screening program tend to be slower growing and less aggressive, while faster growing cases appear clinically faster
3) Lead time bias: Because of screening, cases appear to have a longer survival simply because the disease was identified earlier in the natural history of the disease
4) Overdiagnosis bias: Because of enthusiasm for a new screening program, higher rates of false positives give a false impression of increased diagnosis and unrealistically favorable outcomes