[1] Univ Salerno, I-84084 Salerno, Italy
[2] Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy
[3] Nikhef, NL-1098 XG Amsterdam, Netherlands
[4] Univ Perugia, I-06123 Perugia, Italy
[5] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy
[6] Univ Savoie, CNRS, IN2P3, Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France
[7] Univ Siena, I-53100 Siena, Italy
[8] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy
[9] Univ Paris Diderot, APC, Sorbonne Paris Cite, CNRS,IN2P3,CEA,Irfu,Observ Paris, F-75205 Paris 13, France
[10] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy
[11] European Gravitat Observ, I-56021 Pisa, Italy
[12] Univ Pisa, I-56127 Pisa, Italy
[13] CAMK PAN, PL-00716 Warsaw, Poland
[14] Warsaw Univ, Astron Observ, PL-00478 Warsaw, Poland
[15] Univ Genoa, I-16146 Genoa, Italy
[16] Ist Nazl Fis Nucl, Sez Genova, I-16146 Genoa, Italy
[17] Univ Paris Sud, CNRS, IN2P3, LAL, F-91898 Orsay, France
[18] Radboud Univ Nijmegen, Dept Astrophys, IMAPP, NL-6500 GL Nijmegen, Netherlands
[19] Univ Nice Sophia Antipolis, ARTEMIS, CNRS, F-06304 Nice, France
[20] Observ Cote dAzur, F-06304 Nice, France
[21] Univ Rennes 1, CNRS, Inst Phys Rennes, F-35042 Rennes, France
[22] Univ Urbino Carlo Bo, I-61029 Urbino, Italy
[23] Ist Nazl Fis Nucl, Sez Firenze, I-50019 Florence, Italy
[24] Univ Paris 06, CNRS, UPMC, ENS,Lab Kastler Brossel, F-75005 Paris, France
[25] Vrije Univ Amsterdam, NL-1081 HV Amsterdam, Netherlands
[26] Univ Lyon, CNRS, IN2P3, Adv Mat Lab, F-69622 Lyon, France
[27] Univ Naples Federico II, I-80126 Naples, Italy
[28] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy
[29] Univ Roma Tor Vergata, I-00133 Rome, Italy
[30] Ist Nazl Fis Nucl, Gran Sasso Sci Inst, I-67100 Laquila, Italy
[31] Univ Roma La Sapienza, I-00185 Rome, Italy
[32] Wigner RCP, RMKI, H-1121 Budapest, Hungary
[33] Univ Trento, I-38123 Trento, Italy
[34] Ist Nazl Fis Nucl, Trento Inst Fundamental Phys & Applicat, I-38123 Trento, Italy
[35] Univ Bialystok, PL-15424 Bialystok, Poland
[36] NCBJ, PL-05400 Otwock, Poland
[37] IM PAN, PL-00956 Warsaw, Poland
[38] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
[39] CNRS, ESPCI, F-75005 Paris, France
[40] Univ Camerino, Dipartimento Fis, I-62032 Camerino, Italy
[41] Inst Astron, PL-65265 Zielona Gora, Poland