TY - JOUR T1 - Serum theophylline concentration in general practice patients JF - The Journal of the Royal College of General Practitioners JO - J R Coll Gen Pract SP - 273 LP - 274 VL - 37 IS - 299 AU - D.W. Brown Y1 - 1987/06/01 UR - http://bjgp.org/content/37/299/273.5.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -