https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0224-x
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0225-9
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0228-6
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0222-z
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0226-8
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0223-y
https://bmcpalliatcare.biomedcentral.com/articles/10.1186/s12904-017-0227-7