Corrigendum to 'Shape and period of limit cycles bifurcating from a class of Hamiltonian period annulus' (Nonlinear Anal. 81 (2013) 130--148)

In our paper (Prohens and Torregrosa, 2013 [1] ) we are concerned with the problem of shape and period of isolated periodic solutions of perturbed analytic radial Hamiltonian vector fields in the plane. Actually, there is a mistake in the formula of the first order approximation of the period given in Corollary 4 . Here we give its proper drafting.