PT - JOURNAL ARTICLE AU - Haynes, R Brian TI - Of studies, syntheses, synopses, and systems: the ā€œ4Sā€ evolution of services for finding current best evidence AID - 10.1136/ebm.6.2.36 DP - 2001 Mar 01 TA - Evidence Based Medicine PG - 36--38 VI - 6 IP - 2 4099 - http://ebm.bmj.com/content/6/2/36.short 4100 - http://ebm.bmj.com/content/6/2/36.full SO - Evid Based Med2001 Mar 01; 6