From: The BELFRAIL (BFC80+) study: a population-based prospective cohort study of the very elderly in Belgium
   Median [IQR]
GP-CRA
21 [10-37]
GP-blood test
28 [14-43]
GP-echocardiography
29 [14-43]
CRA-echocardiography
7 [3-15]
CRA-blood test
7 [4-16]
Blood test-echocardiography
3 [1-13]