30128
Abstract The aim of this multicentre , prospective , randomised , investigator blind , controlled clinical trial was to evaluate the clinical efficacy and tolerability of a highly purified human menopausal gonadotrophin ( hMG ) preparation ( Merional - HG ) when administered to patients undergoing controlled ovarian stimulation ( COS ) for in - vitro fertilisation ( IVF ) procedure enrolled in hospital departments .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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