- A randomized trial of 4-aminopyridine in EA2 and related familial episodic ataxias. Strupp, M., Kalla, R., Claassen, J., Adrion, C., Mansmann, U., Klopstock, T., Freilinger, T., Neugebauer, H., Spiegel, R., Dichgans, M., Lehmann-Horn, F., Jurkat-Rott, K., Brandt, T., Jen, J.C., Jahn, K. Neurology (2011)