Recommendations like 'should always' should arouse us.
A. Stang, and O. Kuss. International journal of epidemiology, 39 (2):
634-5(April 2010)5694<m:linebreak></m:linebreak>JID: 7802871; CON: Int J Epidemiol. 2008 Dec;37(6):1430-5. PMID: 18710887; 2009/01/15 aheadofprint; ppublish;.
DOI: 10.1093/ije/dyn365