Additional file 1.

The documents presented here were originally written in Spanish; therefore, were not the actual survey documents. To improve readability in English, minor editorial changes were made. The participants read and answered the questionnaire in Spanish. Invitation letter. The data provided represents the translated invitation letter provided to the patients.

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Verástegui BMC Medical Ethics 2006 7:13   doi:10.1186/1472-6939-7-13