31796
The dynasty was considered mythical by historians until scientific excavations found early Bronze Age sites at Erlitou , Henan in 1959 .
 Erlitou, Henan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Erlitou, Henan