A 2013 study conducted by Wissenschaftszentrum Berlin für Sozialforschung (WZB) found that Islamic fundamentalism was widespread among Muslims in Europe. The study conducted a poll among Turkish immgrants to six European countries: Germany, France, the Netherlands, Belgium, Austria, and Sweden. In the first four countries also Moroccan immigrants were interviewed. Fundamentalism was defined as: the belief that believers should return to the eternal and unchangeable rules laid down in the past; that these rules allow only one interpretation and are binding for all believers; and that religious rules have priority over secular laws. Two thirds of Muslims the majority responded that religious rules are more important than civil laws and three quarters rejecting religious pluralism within Islam. Of the respondents, 44% agreed to all three statements. Almost 60% responded that Muslims should return to the roots of Islam, 75% thought there was only one possible interpretation of the Quran.