ESNM Guidelines on functional constipation in adults: Further reflections and considerations. Issue 9 (9th June 2020) - Brusciano, Luigi; Gualtieri, Giorgia; Gambardella, Claudio; del Genio, Gianmattia; Tolone, Salvatore; Lucido, Francesco Saverio; Terracciano, Gianmattia; Sturiale, Alessandro; Docimo, Ludovico