Variations in health care use within a country are complicated. In some cases they may reflect differences in health needs, in patient preferences or in the diffusion of a therapeutic innovation; in others they may not. There is evidence that some of the observed variations are unwarranted,...

Traditionally, social work in mental and physical health has been practiced from the perspective of the bio-psycho-social model. Now there is developing scientific evidence that physical health problems cannot produce psychological and social environmental problems for people, but to some...