4677
Efficacy of the levonorgestrel intrauterine system ( LNG - IUS ) in the prevention of the atypical endometrial hyperplasia and endometrial cancer : retrospective data from selected obese menopausal symptomatic women .
 Chemical: levonorgestrel; Chemical: LNG
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: levonorgestrel; Chemical: LNG