Definition of a metadata model for a multi-layered clinical practice guideline representation framework. - Matthew Kim; Zachary Turechek; Aziz A. Boxwala; Tonya Hongsermeier; Michael Krall; Frank A. Sonnenberg; Adam Wright; Blackford Middleton; Saverio M. Maviglia (Int. J. Funct. Informatics Pers. Medicine, 2012)