19091
Despite the fact that conventional fabrication approaches such as lithography , imprinting and soft lithography have been widely used for the preparation of microfluidic chips , it is still challenging to achieve complex microfluidic chips with multifunction integration .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None