Assignment Task: What is the key assumption we make when estimating cumulative incidence (i.e. conducting survival analysis) using Kaplan-Meier estimators?
1. All of the participants who are lost to follow-up get the outcome
2. None of the participants who are lost to follow-up get the outcome
3. Participants who are lost to follow have the same risk of the outcome as those who stay in the study
4. We do not make any assumptions about those lost to follow-up since we do not know their outcomes once they are lost