Table 2.

Methodological quality of the expert opinion manuscripts

	Is the opinion clearly identified?	Does the source of the opinion have standing in the field?	Are the interests of the patients the central focus?	Is the opinion’s basis in logic/ experience clearly argued?	Is the argument development analytical?	Is the reference to the extant literature/ evidence and any congruency with it logically defended?	Is the opinion supported by peers?
Briscoe 2000 [27]	Y	U	Y	Y	Y	Y	Y
Hayman 2000 [28]	Y	Y	Y	Y	Y	Y	Y
Wenitong & Adams 2014 [36]	Y	Y	Y	Y	Y	Y	Y

Abbreviations Y yes, N no, U unclear