15303
Articles were included if they specifically investigated the effects of nicotine on ' bone ' or fracture repair in animal or human models or in vitro effects on ' bone cells ' .
 Chemical: nicotine
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: nicotine