Included studies	Date study author contacted	Date study author replied	Date study author was asked for additional information (short summary)	Date study author provided data (short summary)
Chlup 2009	—	—	—	—
Barennes 2005	—	—	—	—
Slama 1990	15 March 2018	8 June 2018	Since according to the manufacturer, the dextrose gel can be applied in two ways (direct ingestion or buccal administration), and this was not clearly stated in the paper, we contacted the study authors to ask for clarification	Study authors answered that the gel was swallowed; therefore we did not categorise this intervention as buccal administration
Gunning 1978	—	—	—	—
—: denotes not reported