21692
The work of Giesen and other Dutch missionaries , helped keep the German missions survive in Shandong during and in the aftermath of World War I .
 Giesen, Shandong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Giesen, Shandong