Table 2.

Overview quality assessment on all studies.

	Yes	No	Unclear
Does the case/the case series mirror the whole experience of the investigator?	3	0	33
Was the exposure adequately ascertained?	20	16	0
Was the outcome adequately ascertained	35	0	1
Were alternative causes ruled out?	14	12	10
Was the case/case series described with sufficient details?	33	0	3