Nintex Observer

Retrieve Submitted Workflows' Tasks using C#

I want to retrieve all the submitted workflows' tasks by the current user using c#. The data i want to get is the same as the one displayed the "Workflows i have started" which is an out of the box SharePoint web part by Nintex. Is there a web service that allows me to do so ? if not what is a possible workaround to get this data ? 

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