RT Journal Article SR Electronic T1 False negative screening tests in phenylketonuria. JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 124 OP 125 DO 10.1136/adc.46.245.124 VO 46 IS 245 A1 J S Yu A1 M T O'Halloran A1 S J Stuckey YR 1971 UL http://adc.bmj.com/content/46/245/124.abstract AB