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Because Warfarin treatment had no effect on the elevation in serum calcium produced by vitamin D , the synergy between Warfarin and vitamin D is probably best explained by the hypothesis that Warfarin inhibits the activity of matrix Gla protein as a calcification inhibitor .
 Warfarin, calcium, vitamin D, Warfarin, vitamin D, Warfarin, calcification
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Warfarin, calcium, vitamin D, Warfarin, vitamin D, Warfarin, calcification