References

Citations
  1. Abel E, Lebwohl M (2008). Psoriasis. In EG Nabel, ed., ACP Medicine, section 2, chap. 3. Hamilton, ON: BC Decker.

  2. Winchester R (2008). Psoriatic arthritis. In K Wolff et al., eds., Fitzpatrick's Dermatology in General Medicine, 7th ed., vol. 1, pp. 194-206. New York: McGraw-Hill Medical.

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