At the end of 2013, we requested the National Hospital In-patient Registry to supply us with data on all patients aged ≥20 years admitted in the period 2009–2011 and having International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) code 357.0 (acute infective polyneuritis) as their principal or other diagnosis at discharge. This registry constitutes a database on discharges generated at all hospitals serving the Spanish National Health Service, which provides services for the large majority of the resident population country-wide and encompasses all hospitals in the surveillance network [25].
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