In Excel, even if a number is entered, it is not always treated as a 'number'. In fact, there are two types of data in Excel: 'numbers' and 'text', and understanding this difference is very important.
Correspondence to Dr Sujoy Banerjee, Department of Neonatal Medicine, Singleton Hospital, Swansea, SA2 8QA, UK; sujoy.banerjee{at}wales.nhs.uk Setting Ten perinatal hospitals in Wales, UK. Patients ...
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