FGF13 and Borjeson-Forssman-Lehmann syndrome: Hearing loss is a common feature found in patients with BFLS, WS and CGH syndromes, all of which are characterized by genetic loss-of-function mutations in the Fgf13 gene (Gecz et al., 1999; DeStefano et al., 2013; Abu-Amero et al., 2014).