analgesia; anastomosis leakage/su [Surgery]; cancer patient; chronic kidney failure; competence; comprehension; coronavirus disease 2019; editorial; health care personnel; health care policy; health care system; health service; hospital patient; human; information; legal liability; lockdown; medical specialist; neoadjuvant therapy; nurse; palliative therapy; pandemic; qualitative research; quality of life; quantitative study; rectum anterior resection; rectum cancer/su [Surgery]; renal replacement therapy; reoperation; risk; supportive care need; opiate agonist; opiate antagonist