Characteristic	Intervention(s) and comparator(s)	Left study due to adverse events [N]	Left study due to adverse events [%]	Hospitalisation [N]	Hospitalisation [%]	Out‐patient treatment [N]	Out‐patient treatment [%]
Ludvik 2002	I1: sweet potato (Caiapo) tablets 2 g	0	0	‐	‐	‐	‐
	I2: sweet potato (Caiapo) tablets 4 g	0	0	‐	‐	‐	‐
	C: placebo	0	0	‐	‐	‐	‐
Ludvik 2004	I: sweet potato (Caiapo) tablets (4 g per day)	0	0	‐	‐	‐	‐
	C: placebo	0	0	‐	‐	‐	‐
Ludvik 2008	I: sweet potato (Caiapo) tablets (4 g per day)	0	0	‐	‐	‐	‐
	C: placebo	0	0	‐	‐	‐	‐
Footnotes "‐" denotes not reported C: comparator; I: intervention