B. G. Samolsky Dekel, MD, PhD, M. C. Sorella, MD, A. Vasarri, MD, A. Gori, MD, and R. M. Melotti, MD, “Opioid-induced constipation in mixed chronic pain patients: Prevalence and predictors analysis”, J of Opioid Management, vol. 15, no. 5, pp. 375–387, Sep. 2019.