Ferro, G., Romano, E., Frosini, P. and Pizzarelli, F. 2018. Venipuncture at fixed sites (buttonhole technique): report of two clinical cases. Giornale di Clinica Nefrologica e Dialisi. 26, 1 (Jan. 2018), 37–40. DOI:https://doi.org/10.33393/gcnd.2014.858.