Table 1.

Risk of bias assessment according to the Cochrane collaboration's risk of bias assessment tool.

Study, Year (reference)	Random sequence generation	Allocation concealment	Blinding of participant and its personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Overall assessment of risk of bias
Del Prato et al. (29)	Low	Low	Low	Low	Unclear	Low	Low
Heise et al. (30)	Low		Low	Low	Unclear	Low	Unclear
Dahl et al. (31)	Low	Low	Low	Low	Unclear	Low	Low
Jastreboff et al. ( 32)	Low	Low	Low	Low	Unclear	Low	Low
Rosenstock et al. ( 33)	Low	Unclear	Low	Low	Unclear	Low	Unclear
Gastaldelli et al. (34)	Low	Low	Low	Low	Unclear	Low	Low
Ludvik et al. (35)	Low	Low	Low	Low	Unclear	Low	Low
Frias et al. (36)	Low	Low	Low	Low	Unclear	Low	Low