https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0200-5
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0199-7
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0201-4
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0197-9
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0196-x
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0198-8