“…2002, Berliner & Ginzberg 2002, Newman & Maylor 2002, Tierney 2003), and an ageing nursing workforce (Buchan 2002, Goodin 2003). Furthermore, the introduction of health care assistants in the UK and unlicensed practitioners in the USA has led to alterations in skill mix, with some commentators suggesting that such changes may also negatively affect quality (Gibbs et al. 1991, Morris 1992, Davison 1994, Cahill 1995, Blegen et al.…”