GJB2 and hearing loss disorder: 23 Palmada Palmada M M Schmalisch Schmalisch K K Bohmer Bohmer C C Schug Schug N N Loss of function mutations of the GJB2 gene detected in patients with DFNB1- associated hearing impairment Loss of function mutations of the GJB2 gene detected in patients with DFNB1- associated hearing impairment Neurobiol Disord.