Date	Event	Description
11 March 2017	New citation required but conclusions have not changed	No new studies identified. The only change was to add the search results.
11 March 2017	New search has been performed	417 references, 13 duplicates. 390 irrelevant on title/abstract; 13 excluded. 1 citation for an already included study (Leuppi 2013). 1 ongoing study identified (Leuppi 2017). No new studies included, no change to conclusions.