6 [43] T. Dent, S. Stern and C. Wetterich, Phys. Rev. D 76 (2007) 063513 [arXiv:0705.0696 [astro-ph]]. [37] W. C. Jones et al. , arXiv:astro-ph/0507494; F. Piacentini et al. , arXiv:astro-ph/0507507; arXiv:astro-ph/0507514. [36] H. C. Chiang et al. , arXiv:0906.1181 [astro-ph.CO]. [35] M. L. Brown et al. [QUaD collaboration], arXiv:0906.1003 [astro-ph.CO]. [34] C. L. Reichardt et al. , Astrophys. J. 694 (2009) 1200 [arXiv:0801.1491 [astro-ph]]. [33] E. Komatsu et al. , arXiv:0803.0547 [astro-ph]. [32] G. Hinshaw et al. [WMAP Collaboration], arXiv:0803.0732 [astro-ph]. [31] A. Lewis and S. Bridle, Phys. Rev. D 66 , 103511 (2002) (Available from http://cosmologist.info .) [30] A. Lewis, A. Challinor and A. Lasenby, Astrophys. J. 538 (2000) 473 [arXiv:astro-ph/9911177]. [38] A. C. S. Readhead et al. , Astrophys. J. 609 , 498 (2004). [39] A. G. Riess et al. , Astrophys. J. Suppl. 183 (2009) 109 [arXiv:0905.0697 [astro-ph.CO]]. [40] O. Pisanti et al. , Comput. Phys. Commun. 178 (2008) 956 [arXiv:0705.0290 [astro-ph]]. [41] P.D. Serpico et al. , 2004 JCAP 0412 010 [astro- ph/0408076]. [42] S. Galli, F. Iocco, G. Bertone and A. Melchiorri, Phys. Rev. D 80 (2009) 023505 [arXiv:0905.0003 [astro- ph.CO]].