[1] Osped Acireale, Div Gastroenterol, Azienda Sanit Provinciale Catania, Catania, Italy
[2] Tel Aviv Med Ctr & Sch Med, Dept Gastroenterol, Liver Unit, Tel Aviv, Israel
[3] Univ Haifa, Sch Publ Hlth, IL-31999 Haifa, Israel
[4] Univ Catania, Dept Biomed Sci & Biotechnol, Catania, Italy
[5] Washington Univ, Sch Med, Ctr Human Nutr, St Louis, MO USA
[6] Washington Univ, Sch Med, Atkins Ctr Excellence Obes Med, St Louis, MO USA