PdB acknowledges support from University of Rome La Sapienza (project “Cosmologia di Precisione 2015”) and from the Italian Space Agency (Agreement 2016-019-H.0 “Kinetic Inductance Detectors for Space”). CJM is supported by an FCT Research Professorship, contract reference IF/00064/2012, funded by FCT/MCTES (Portugal) and POPH/FSE (EC). C.H.-M. acknowledges the financial support of the Spanish Ministry of Economy and Competitiveness via I+D project AYA-2015-66211-C2-2-P. GDZ acknowledges the financial support of ASI/INAF agreement n. 2014-024-R.1. J.G.N. acknowledges financial support from the Spanish MINECO for a “Ramon y Cajal” fellowship (RYC-2013-13256) and the I+D 2015 project AYA2015-65887-P (MINECO/FEDER). F.J.C., E.M.-G. and P.V. acknowledge support from the Spanish Ministerio de Econom´ıa y Competitividad project ESP2015-70646- C2-1-R co-financed with EU FEDER funds.