@inbook{1161331277, author={Cathal O’Connor and Grainne M. O’Regan and Alan D. Irvine}, editor={Kang, Sewon and Amagai, Masayuki and Bruckner, Anna L. and Enk, Alexander H. and Margolis, David J. and McMichael, Amy J. and Orringer, Jeffrey S.}, title={Porokeratosis}, booktitle={Fitzpatrick's Dermatology, 9e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2019}, url={dermatology.mhmedical.com/content.aspx?aid=1161331277} }