An analytic approach to sunset diagrams in chiral perturbation theory: Theory and practice B. Ananthanarayan, Johan Bijnens, Shayan Ghosh and Aditya Hebbar Eur. Phys. J. A, 52 12 (2016) 374 Published online: 30 December 2016 DOI: 10.1140/epja/i2016-16374-8