TY - JOUR T1 - Chronicity and complexity JF - Canadian Family Physician JO - Can Fam Physician SP - 1655 LP - 1658 VL - 54 IS - 12 AU - Ross E.G. Upshur AU - Shawn Tracy Y1 - 2008/12/01 UR - http://www.cfp.ca/content/54/12/1655.abstract N2 - ER -