Conceptualization of a measure of performance of counseling regarding herbal and dietary supplements (HDS). S1, Sn= items created for “subjective” component; O1, On=items created for “objective” component; C1, Cn=items created for “content” component; P1, Pn=items created for “process” component; A1, An=items created for “recommendation” component; D1, Dn=items created for “documentation” component; M1, Mn=items created for “monitoring” component.