Long-term nutritional deficiencies following sleeve gastrectomy: a 6-year single-centre retrospective study - Mulita, Francesk; Lampropoulos, Charalampos; Kehagias, Dimitrios; Verras, Georgios-Ioannis; Tchabashvili, Levan; Kaplanis, Charalampos; Liolis, Elias; Iliopoulos, Fotios; Perdikaris, Ioannis; Kehagias, Ioannis (Menopause Review/Przegląd Menopauzalny, 2021)