Acknowledgments
Fieldwork of F.R. and C.G. was carried out within the framework of the Ev-K2-CNR Project, and thanks to contributions from the Italian National Research Council and the Italian Ministry of Foreign Affairs. Laboratory work of F.R. and C.G. was supported by P.R.I.N. Cofin 2006. Editorial handling by the guest editors R. Carosi and S.M. Rai was greatly appreciated.