930
During a ten - year period , 348 women were studied for a total of 5 , 877 patient months in four separate studies relating oral contraceptives to changes in hematologic parameters .
 Chemical: oral contraceptives
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: oral contraceptives