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LA Lill-Brith Wium von Arx
HG Helge Gydesen
SS Søren Skovlund
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The questionnaire was sent by postal mail to all insulin users with type 2 diabetes in the registry (n=3160) with a prepaid return envelope included. A unique identifier was assigned by FDDB to ensure respondent anonymity and allow linkage between the self-reported and register data.

Respondents were informed that by answering the questionnaire, consent was given to obtain information from their registered health information. No remuneration was offered for participation. Access to the registry was contingent on study approval by the Danish data protection agency and the registry steering committee.

Copyright and License information:  ©2016 Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/
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