_:vb50940353 . _:vb50940353 . _:vb50940353 "A nonsyndromic congenital nail disorder that is characterized by a decreased growth rate, thick and hard nails, and a straight or concave proximal edge of detachment."^^ . _:vb50940353 . _:vb50940353 . _:vb50940353 "url:https://pubmed.ncbi.nlm.nih.gov/26149975/"^^ .