Are Treatments More Effective than Placebos? A Systematic Review and Meta-Analysis Howick, Jeremy ; Friedemann, Claire ; Tsakok, Maria ; Watson, Robert ; Tsakok, Teresa ; Thomas, Jennifer ; Perera, Rafael ; Fleming, Susannah ; Heneghan, Carl Abstract Publication: PLoS ONE Pub Date: May 2013 DOI: 10.1371/journal.pone.0062599 Bibcode: 2013PLoSO...862599H