3) Thomas EJ, Studdert DM, Burstin HR, Orav EJ, Zeena T, Williams EJ, et al: Incidence and types of adverse events and negligent care in Utah and Colorado. Med Care 38261-271, 2000.
4) Wilson RM, Runciman WB, Gibberd RW, Harrison BT, New by L, Hamilton JD: The quality in Australian health care study. Med J Aust 163:458-471, 1995.
5) Vincent C, Neale G, Woloshynowych M: Adverse events in British hospitals. BMJ 322517-519, 2001.