Liukkonen, V; Virtanen, P; Kivimaki, M; Pentti, J; Vahtera, J; (2008) Sense of coherence and attrition during four-year follow-up in cohorts of permanent and non-permanent Finnish employees. BMC PUBLIC HEALTH , 8 (ARTN 88) 10.1186/1471-2458-8-88. Green open access