S. Thamakaison, D. Lertrattananon, S. Tubtimtes, T. Pumkompol, and S. Somsri, “The Referral from Family Practice to GI Specialty: The Concordance of Diagnosis and Propriety of Consultation”, Rama Med J, vol. 38, no. 4, pp. 294–306, Dec. 2015.