How important is it to identify avoidable hospital readmissions with certainty?

See related research article by van Walraven and colleagues at [www.cmaj.ca/cgi/doi/10.1503/cmaj.101860][1] Many policy-makers believe that if we cannot reduce hospital readmissions, we cannot improve the health care system.[1][2] In this issue, van Walraven and colleagues[2][3] expertly summarize