Moreover, the World Council of Churches (WCC) general secretary Rev. Dr Olav Fykse Tveit has expressed concern at the methodology and results of the Albania Census 2011. He has raised questions in regard to the reliability of the process which, he said, has implications for the rights of religious minorities and religious freedoms guaranteed in the country's constitution. Tveit expressed this concern in letters issued at the beginning of May to the WCC president Archbishop Anastasios, to Prof. Dr Heiner Bielefeldt, United Nations Special Rapporteur on Freedom of Religion or Belief, and to the Albanian government.