Frequency of undocumented medication discrepancies in discharge letters after hospitalization of older patients: a clinical record review study.

"Conflict of interest statement: The authors declare that there is no conflict of interest."

"Funding: The author(s) received no financial support for the research, authorship, and/or publication of this article."

"All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments and Danish legislation. Informed consent was obtained from all individual participants included in the randomized study. The study protocol of the randomized study was approved by the Danish Data Protection Agency and the Regional Scientific Ethics Committees for Southern Denmark (registration number S-20110161). According to Danish law, data could be transferred to the clinical record review study after approval from the institutional board as the aim was in concordance with the aim of the randomized study."