Assertion: ankylosing spondylitis's symptom | /r/CapableOf | precede psoriasis
Facets:
value: in about 15 percent of cases
type: OTHER
Source sentences:
text: In about 70 percent of PsA cases, psoriasis appears first, though arthritis symptoms precede psoriasis in about 15 percent of cases and in another 15 percent of cases, the joint and skin symptoms strike at the same time.