Cause to effect progression is seen in all EXPECT:
Case control studies aare called retrospective studies. Both exposure and outcome has already occured. The study proceeds backwards from effect to cause It uses control or comparison group to suppo or refute an inference. Parks textbook of preventive and social medicine.K Park. Edition 23.Pg no: 71
Case control study
Ecological study
Coho study
Randomized control trail
Epidemiology