(2018-01-11) Mc Cord, Kimberly A.; Al-Shahi Salman, Rustam; Treweek, Shaun P; Gardner, Heidi Rebecca; Strech, Daniel; Whiteley, William; Ioannidis, John P. A.; Hemkens, Lars; University of Aberdeen.Aberdeen Centre for Evaluation; University of Aberdeen.Institute of Applied Health Sciences