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Fischer, F. Salamida, G. Araujo, GERDA Collaboration: M. Agostini, G. Lutter, G. Marshall, G. Zuzel, H. Khushbakht, H. Simgen, I. Barabanov, I. Lippi, I. Nemchenok, I.V. Kirpichnikov, I. Zhitnikov, J. Hakenm\\\"uller, J. Janicsk\\'o Cs\\'athy, J. Jochum, J. Schreiner, K. Gusev, K. Kilgus, K. Pelczar, K.T. Kn\\\"opfle, K. von Sturm, K. Zuber, L. Baudis, L. Bezrukov, L. Manzanillas, L. Pandola, L. Pertoldi, L. Rauscher, L. Shtembari, L.V. Inzhechik, M. Balata, M. Fomina, M. Hult, M. Junker, M. Laubenstein, M. Lindner, M. Misiaszek, M. Morella, M. Neuberger, M. Redchuk, M. Sch\\\"utt, M. Schwarz, M. Shirchenko, M. Wojcik, N. Di Marco, N. Rumyantseva, O. Kochetov, O. Schulz, O. Selivanenko, P. Grabmayr, P.-J. Chiu, P. Krause, P. Piseri, R. Brugnera, S. Belogurov, S. Calgaro, S. Hemmer, S. Riboldi, S. Sailer, S. Sch\\\"onert, S. Sullivan, S.V. Zhukov, T. Comellato, T. Kihm, T. Wester, V. Biancacci, V. Bothe, V. D'Andrea, V. Gurentsov, V. Kazalov, V.N. Kornoukhov, V.V. Kuzminov, W. 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