Effective treatment of early Barrett’s neoplasia with stepwise circumferential and focal ablation using the HALO system - Gondrie, J J; Pouw, R E; Sondermeijer, C M T; Peters, F P; Curvers, W L; Rosmolen, W D; Ten Kate, F; Fockens, P; Bergman, J J (Endoscopy, 2008)