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As the diagnosis of a wide range of diseases , including various types of cancers and many endemics , relies on optical techniques , numerous compact and cost - effective optical imaging platforms have been developed in recent years for use at the POC .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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