“…Although the literature describes many variations of helmet therapy (Bialocerkowski et al, 2008, McGarry et al, 2008, adverse outcomes of this treatment modality have been only reported as an observation by a few authors (Clarren, 1981, Loveday andde Chalain, 2001). To date there have been no studies focussed on the adverse effects of helmet therapy (McGarry et al, 2008).…”