Duchenne muscular dystrophy: relevant paper was not included

doi:10.1136/bmj.323.7323.1253

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Robert A Smith (Robert.A.Smith@excha.yhs-tr.northy.nhs.uk), consultant paediatrician,
Robert S Phillips, specialist registrar

York District Hospital, York YO31 8HE

EDITOR—Dorling and Salt describe an evidence based approach to the assessment of a boy with locomotor developmental delay manifesting as late walking.1 In their literature search they have missed a relevant paper.2 This paper was probably not identified by their literature search as it is incorrectly indexed in Medline as a case report rather than a prospective cohort study. The fallibility of electronic databases is well known, and because of this previous authors have highlighted the need for expert help when performing a systematic review. …