Arora, A., S. Saini, V. Nautiyal, S. K. Verma, M. Gupta, B. P. Kalra, and M. Ahmad. “Detailed Study on Pattern of Cancer Pain in Patients Admitted at a Tertiary Care Centre in Northern India- A Prospective Observational Study”. Innovations in Medicine and Medical Research Vol. 2, Apr. 2020, pp. 1-11, https://stm1.bookpi.org/index.php/immr-v2/article/view/1204.