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In the article "Aberrant Left Pulmonary Artery" by Clarkson et al which appeared in the March edition of the Journal (p 373) the complete academic title for the co-author Donald G. Ritter is Donald G. Ritter, MS (Ped), MD.
ERRATUM. Am J Dis Child. 1967;114(1):63. doi:10.1001/archpedi.1967.02090220069011