Using epidemiological measures, prioritize what population subgroups should be targeted in a screening program for the following health conditions

Using epidemiological measures, prioritize what population subgroups should be targeted in a screening program for the following health conditions: or pharyngeal cancer, testicular cancer, and skin cancer (all types). What challenges do you foresee to the effectiveness of the screening programs in the subpopulations you have identified? What might be some of the barriers to participation in the screening programs and how might these barriers be addressed?