antibiotic resistance; antimicrobial stewardship; bacterial infection; cancer therapy; cause of death; chemotherapy; coronavirus disease 2019; febrile neutropenia; governmental organization; greenhouse effect; health care system; health disparity; hematologist-oncologist; human; immunocompromised patient; infection control; intensive care unit; microbiologist; mortality rate; non-governmental organization; note; oncologist; pandemic; physician; poverty; World Health Organization; antibiotic agent; colistin; growth promotor; non prescription drug