Nasr, B., et al. “Balanitis Xerotica Obliterans in Non-Identical (dizygotic) Twin Boys”. European Journal of Pediatric Dermatology, vol. 22, no. 3, Sept. 2012, pp. 197-00, https://ejpd.migration.pkpps03.publicknowledgeproject.org/index.php/journal/article/view/821.