Does Democracy reduce or increase corruption?

Please refer to peer reviewed articles such as Does democracy reduce corruption? by Ivar Kolstad & Arne Wiig, \”Democracy and political corruption: A cross-national comparison\” by HUNG-EN SUNG,
The causes of corruption: a cross-national study by Daniel Treisman, The dynamics of political corruption: Re-examining the influence of democracy
by Charles H. Blake & Christopher G. Martin, Abstract:
Corruption: Democracy, Autocracy, and Political Stability by Kanybek Nur-tegin &