https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-018-0373-6
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-018-0378-1
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-018-0376-3
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-018-0377-2
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-018-0375-4