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Differential effects of 1 , 4 - dihydropyridine calcium channel blockers : therapeutic implications .
 Chemical: 1 , 4 - dihydropyridine; Chemical: calcium channel blockers
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: 1 , 4 - dihydropyridine; Chemical: calcium channel blockers