104109
He initially expressed doubts in regards to theories of puerperal fever that were espoused by Ignaz Semmelweis ( 1818-1865 ) .
 Ignaz Semmelweis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ignaz Semmelweis