Table 2.

Step II: numerical search results.

Keywords	Cochrane	PubMed	PMC	Elsevier	PEDro	ISI	Total
“upper limb exoskeleton”	0	33	63	3	1	155	255
“upper limb mobile robot”	0	0	0	0	0	0	0
“upper limb wearable robot”	0	0	0	0	0	1	1
“upper limb portable robot”	0	0	0	0	0	0	0
“upper limb robotic exoskeleton”	0	3	1	0	0	12	16
‘upper limb robotic orthosis’	0	0	0	0	0	0	1
“upper limb robotic device”	0	0	0	0	0	0	0
Total	0	36	64	3	1	169	273