Retraction Note: Peripheral blood mono-nuclear cells implantation in patients with peripheral arterial disease: a pilot study for clinical and biochemical outcome of neoangiogenesis. - Amato B; Compagna R; Corte GA; Martino G; Bianco T; Coretti G; Rossi R; Braucci A; Aprea G; Zeppa P; Puzziello A; Terranova C (BMC surgery, 2016)