Ghrelin, glucagon-like peptide-1, and peptide YY secretion in patients with and without weight regain during long-term follow-up after bariatric surgery: a cross-sectional study - Charalampos Lampropoulos; Francesk Mulita; Theodoros Alexandrides; Dimitrios Kehagias; Dimitra Kalavrizioti; Konstantinos Albanopoulos; Neoklis Georgopoulos; Evangelos Papachristou; Ioannis Kehagias (Menopause Review, 2022)