Author, year

n

Group

Incident rate

Elder, 2013

73

All patients

1.4

Wallihan, 2013

42

Followed by imaging

2.3

Pundi, 2016

1138

195

All patients

Followed by imaging

0.44

2.6

Kuwabara, 2018

2700

All patients

0.18

Nandwana, 2018

113

Followed by imaging

4.4