Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13014-019-1292-2/MediaObjects/13014_2019_1292_Fig2_HTML.png)
a: Time to first occurrence of OM grade ≥ 3 – Modified intention to treat analysis. b: Time to first occurrence of OM grade ≥ 3 – Per protocol analysis. Arm A: active Lasertherapy arm - Arm B: control placebo, arm (Laser-off treatment), OM: Oral mucositis