Mauthner who returned it a few days later. However, wishing to hide his artistic inclinations from his mother, Döblin had sent the manuscript under a false name, and was not able to retrieve it at the post office; he thus had to rewrite it entirely. 1900–1914: University years and early career After receiving his Abitur in 1900, Döblin enrolled at Friedrich Wilhelm University (now Humboldt University of Berlin) and began studying general medicine. In May 1904 he moved to Freiburg im Breisgau to continue his studies, concentrating on neurology and psychiatry. He began his dissertation ("Disturbances of memory in Korsakoff's Psychosis") in the winter semester of 1904–1905 at the Freiburg psychiatric clinic. His dissertation, completed in April 1905, was published that year by Berlin's Klett Verlag. He applied for assistantships in Berlin and in Stettin, where he was apparently turned down on account of his Jewish origins, before taking a short-lived position as assistant doctor at a regional asylum in Regensburg. On 15 October 1906 he took up a position at the Berlin psychiatric clinic in Buch where he worked as an assistant doctor for nearly two years. He then transferred to the city hospital "Am Urban," where he dedicated himself to internal medicine with a renewed interest. He opened his first private practice in October 1911 at Blücherstrasse 18 in Berlin's Kreuzberg neighborhood, before moving the practice to Frankfurter Allee 184 in Berlin's working-class east. While working in Buch he met Friede Kunke, a 16-year-old nurse from a Protestant background with whom he became romantically involved. In the spring of 1909 he began seeing the 21-year-old Erna Reiss, a medical student and daughter of a wealthy Jewish factory owner. Despite his continued involvement with Kunke, at the urging of his family he was reluctantly engaged to Reiss on 13 February 1911 and married her on 23 January 1912; his older brother Hugo and Herwarth Walden served as best men. During the early part of his engagement to Reiss, he had been unaware that Kunke was pregnant: their son Bodo was born on 14 October 1911 and was raised by his grandmother, Elise Kunke, in Schleswig-Holstein following Friede's death from tuberculosis in 1918. Until the end of his life, Döblin maintained loose contact with Bodo, and his treatment of Friede became a lasting source of guilt. Döblin's first son with Erna Reiss, Peter Döblin, was born on 27 October 1912,