Analysis of the impact of bariatric surgery on medium-term pharmacological expenditure Laura Granel Villach; José Manuel Laguna Sastre; José Miguel Ibáñez Belenguer; Homero Alfredo Beltrán Herrera; Raquel Queralt Martín; Carlos Fortea Sanchis; David Martínez Ramos; Vicente Javier Escrig Sos;