Mastic Gum http://www.nejm.org/ http://www.nejm.org/doi/full/10.1056/NEJM199812243392618 http://www.nejm.org/doi/full/10.1056/NEJM199812243392618 Source Nottingham University review http://www.nejm.org/doi/full/10.1056/NEJM199812243392618 http://www.nejm.org/doi/full/10.1056/NEJM199812243392618 research at the University of Nottingham http://www.nejm.org/doi/full/10.1056/NEJM199812243392618 research at the University of Nottingham digestion Mastic Gum Kills Helicobacter pylori killing H. pylori infection http://www.nejm.org/doi/full/10.1056/NEJM199812243392618 research at the University of Nottingham studio preliminare del 1998