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Future research should be based on strict criteria to define poor responders , and large , well - designed RCTs are necessary to definitively answer the important question of whether there was need to use rLH in poor responders undergoing IVF .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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