Parents were interviewed upon entry into the study and after a period of 8 - 10 years. (link.springer.com)
The researchers used data from the Veterans Affairs Normative Aging Study, which looked at 1,315 men ages 53 to 85 years of age — predominantly made up of white males who were initially in good health at entry into the study in the 1960s. (sciencedaily.com)
«This work constitutes our first entry into the study of rare variants in common diseases that confer large risk of disease. (decode.com)