We - are you one of the authors? Perhaps you can clarify the following paragraph from [1], page 8: >Inclusion Criteria and Variable Classification: >Subjects

We - are you one of the authors? Perhaps you can clarify the following paragraph from [1], page 8: >Inclusion Criteria and Variable Classification: >Subjects from 0-17 years old were included using a primary search term for diagnosis of “ingested object” from the time period of 2002-2015. Cases of ingested objects were classified as “suspected magnet ingestion” (SMI) if the term “magnet” appeared anywhere in the narrative section of the database. Where's the screening part you mention? I didn't find anywhere that the inclusion criteria implied that magnets have actually been ingested - or that the results were filtered in any way other than a keyword search. E.g.: "Child ingested a marble, parent worries that it could have been a magnet" would pass this inclusion criterion. [1]http://sci-hub.nu/10.1097/MPG.0000000000001830 http://sci-hub.nu/10.1097/MPG.0000000000001830