Psoriatic arthritis (PsA) most often appears among adults in which one of the following age ranges?
A child is most likely to develop PsA at which age?
PsA usually presents approximately how many years after psoriasis begins?
Which of the following is true of the connection between psoriasis severity and PsA severity?
An individual with PsA can be classified as having a severe form of the condition if he or she has at least how many affected joints.
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