Nugroho, A., F. Arifin, P. Widianto, A. A. Wibowo, A. Y. Handaya, I. Kristian, M. I. Rivai, M. Mulyawan, M. Niam, P. Budiono, M. D. Putro, and W. Warsinggih. “Digestive Surgery Services in COVID-19 Pandemic Period: Indonesian Society of Digestive Surgeons Position Statement”. Journal Of The Indonesian Medical Association, Vol. 70, no. 6, July 2020, pp. 132-41, doi:10.47830/jinma-vol.70.6-2020-239.