Before revision: Some typical scenarios this would apply to include, or example, a surveyor doing social research conducts an interview with a participant, or a researcher for a clinical trial asks for a blood sample from a participant to see if there is a relationship between something which can be measured in blood and a person's health.
After revision: Some typical scenarios this would apply to include, or example, a surveyor doing social research conducts an interview with a participant, or a medical researcher in a clinical trial asks for a blood sample from a participant to see if there is a relationship between something which can be measured in blood and a person's health.