19940
METHODS : Rats were subcutaneously implanted with mini - osmotic pumps delivering 0 , 0 . 25 , or 1 mg / h of DP during 1 week .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None