“…Additionally, we then included 4 studies that were known to us [33], [34], [35], [36] but had not been identified through the MEDLINE search. A total of 8 studies were, therefore, included in the review [10], [25], [33], [34], [35], [36], [37], [38]. All studies were carried out exclusively in Germany, with the exception of one study that included a mixed population from the Netherlands and Germany [38].…”