1. Department of Physics, University of Texas at Austin , Austin, TX 78712, USA
2. Gravitation Astroparticle Physics Amsterdam (GRAPPA), Institute for Theoretical Physics Amsterdam and Delta Institute for Theoretical Physics, University of Amsterdam , Science Park 904, NL-1090 GL Amsterdam, the Netherlands
3. The Oskar Klein Centre, Department of Physics, Stockholm University , AlbaNova, SE-10691 Stockholm, Sweden
4. Nordic Institute for Theoretical Physics (NORDITA) , SE-106 91 Stockholm, Sweden
5. Department of Physics, University of California Berkeley , Berkeley, CA 94720, USA
6. Department of Physics, University of Wisconsin-Madison , Madison, WI 53706, USA
7. Niels Bohr International Academy and DARK, Niels Bohr Institute, University of Copenhagen , Blegdamsvej 17, DK-2100 Copenhagen, Denmark
8. Center for Neutrino Physics, Department of Physics, Virginia Tech , Blacksburg, VA 24061, USA
9. Kavli IPMU (WPI), UTIAS, The University of Tokyo , Kashiwa, Chiba 277-8583, Japan