TY - JOUR T1 - `Clustering' of Multiple Sclerosis Cases by Date and Place of Birth JF - British Journal of Preventive & Social Medicine JO - Br J Prev Soc Med SP - 247 LP - 247 DO - 10.1136/jech.24.4.247 VL - 24 IS - 4 A2 - , Y1 - 1970/11/01 UR - http://jech.bmj.com/content/24/4/247.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -