A total of 335 citations were identified in the literature search. Following screening of titles and abstracts, 306 citations were excluded and 29 potentially relevant reports from the electronic search were retrieved for full-text review. 8 potentially relevant publications were retrieved from the grey literature search, and 3 from hand searching. Of these potentially relevant articles, 20 publications were excluded for various reasons, while 20 publications describing 18 studies11Two studie...
