urn:ddi:int.naddi:628a7f92-c102-4088-b1b1-f5aac913b327:1 int.naddi 628a7f92-c102-4088-b1b1-f5aac913b327 1 jeremy 2016 data wed_col_comments Comments on Documenting Questionnaires and Datasets with DDI: A hands-on Introduction with Colectica