New nomenclature and DNA testing guidelines for myotonic dystrophy type 1 (DM1). The International Myotonic Dystrophy Consortium (IDMC). by Ashizawa, T, Gonzales, I, Ohsawa, N, Singer, R, Devillers, M, Ashizawa, T, Balasubramanyam, A, Cooper, T, Khajavi, M, Lia-Baldini, A, Miller, G, Philips, A, Timchenko, LT, Waring, J, Yamagata, H, Barbet, J, Klesert, T, Tapscott, S, Roses, A, Wagner, M, Baiget, M, Martorell, L, Browne, G, Eymard, B, Gourdon, G