Author

Original No.

of patients

Final No.

of patients

Reason of loss of follow-up within 5 years

Krack, et al. [3]

49

42

3 death (unknown details), 4 unable to return (2 lived overseas, 2 personal reason)

Schüpbach, et al. [4]

37

30

6 death (2 progression of PD, 1 suicide, 1 CVD, 2 sudden death)

1 unable to return due to moving

Wider, et al. [5]

50

37

13 death (3 suicide, 7 infectious disease, 2 pulmonary embolism, 1 myocardial infarction)

Gervais-Bernard, et al. [6]

42

23

5 death (1 suicide, 5 other disease), 14 unable to return (unknown details)

Moro, et al. [7]

68

35

24 death (unknown details), 5 unable to return (unknown details)

Our series

55

43

7 death, 5 unable to return due to progression of PD