Esa, D. F., H. Shatri, C. M. Rumende, A. Susilo, H. Maulahela, A. Fauzi, and M. Simadibrata. “Validity and Reliability of the Indonesian Version of the 9-Item Inflammatory Bowel Disease Questionnaire (IBDQ-9)”. Medical Journal of Indonesia, vol. 32, no. 3, Dec. 2023, pp. 168-72, doi:10.13181/mji.oa.236848.