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Michael Heidelberger took their advice and in 1911 went to Zurich to work for a year in the laboratory of the organic chemist and future Nobel Laureate Richard Willstatter at the Eidgenossische Technische Hochschule. There he perfected the synthesis of cyclooctatetraene, an important intermediate in organic research. Willstatter helped his somewhat impecunious American student by sharing the cost of laboratory supplies with him, arranging that when expensive materials, such as silver nitrate, were to be bought, it was his turn to pay, while Heidelberger took turns buying cheaper materials like sulfuric acid. ``Better training than that you couldn't have,'' Heidelberger summed up his experience with Willstatter. They remained friends for three decades, through Willstatter's flight from Germany in 1938 and until his death in Switzerland in 1942.
 Michael Heidelberger, Switzerland
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: place of death, place of birth, education degree, education institution 
Text: {0} 
Answer:
 Michael Heidelberger, Switzerland