Table 1.

Intervention period of reported studies (n=32).

Intervention duration	Studies, n (%)
12 weeks	7 (22)
24 weeks	6 (19)
N/Aa	6 (19)
4 weeks	4 (13)
8 weeks	2 (6)
16 weeks	2 (6)
48 weeks	1 (3)
6 weeks	1 (3)
2 weeks	1 (3)
26 weeks	1 (3)
3 weeks	1 (3)

^aN/A: not applicable.