Folic-acid Deficiency in Rheumatoid Arthritis: Relation of Levels of Serum Folic-acid Activity of Treatment with Phenylbutazone. Issue 5490 (26th March 1966) - Deller, D. J.; Urban, E.; Ibbotson, R. N.; Horwood, Jennifer; Milazzo, S.; Robson, H. N.