http://www.orpha.net/consor/cgi-bin/OC_Exp.php?Lng=FR&Expert=231183 2011 France scientific and technical information usher syndromes usher syndromes
--- http://www.orpha.net/consor/cgi-bin/OC_Exp.php?Lng=FR&Expert=231169 2011 France scientific and technical information usher syndromes usher syndromes