Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Hattori Seiji and Igarashi Tae and Takarada Junko and Sano Hiromi and Oshima Tsutomu and Yokota Miyuki,Opioids in cancer pain management,Drug Delivery System,09135006,THE JAPAN SOCIETY OF DRUG DELIVERY SYSTEM,2011,26,5,461-467,https://cir.nii.ac.jp/crid/1390282679617194112,https://doi.org/10.2745/dds.26.461