TY - JOUR T1 - Rheumatoid factors in families. JF - Annals of the Rheumatic Diseases JO - Ann Rheum Dis SP - 269 LP - 274 DO - 10.1136/ard.29.3.269 VL - 29 IS - 3 AU - J S Lawrence AU - H A Valkenburg AU - J M Bremner AU - J Ball Y1 - 1970/05/01 UR - http://ard.bmj.com/content/29/3/269.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -