A blinded international study on the reliability of genetic testing for GGGGCC-repeat expansions in C9orf72 reveals marked differences in results among 14 laboratories. by Akimoto, C, Volk, A, van Blitterswijk, M, Van den Broeck, M, Leblond, C, Lumbroso, S, Camu, W, Neitzel, B, Onodera, O, van Rheenen, W, Pinto, S, Weber, M, Smith, B, Proven, M, Talbot, K, Keagle, P, Chesi, A, Ratti, A, van der Zee, J, Alstermark, H, Birve, A, Calini, D, Nordin, A, Tradowsky, D, Just, W