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Combination treatment with progesterone and vitamin D hormone is more effective than monotherapy in ischemic stroke : The role of BDNF / TrkB / Erk1 / 2 signaling in neuroprotection .
 Chemical: progesterone; Chemical: vitamin D
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: progesterone; Chemical: vitamin D