TY - JOUR T1 - A novel placebo-controlled clinical study design without ethical concerns - The free choice paradigm JO - Medical Hypotheses PY - 2012/01/01 AU - Enck P AU - Klosterhalfen S AU - Grundy D ED - DO - DOI: 10.1016/j.mehy.2012.09.017 Y2 - 2024/12/22 ER -