Question:
Where was Stefan Bergman educated in Jun, 1913?

Context:
 Stefan Bergman attended University of Vienna from Jan, 1915 to Jan, 1920. 
 Stefan Bergman attended Frederick William University from Jan, 1921 to Jan, 1922. 
 Stefan Bergman attended University of Wrocław from Jan, 1913 to Jan, 1915.

Answer:
University of Wrocław