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A retrospective analysis of data accumulated over a 21 - month period , from December 1989 to September 1991 , regarding investigational use of a 308 nanometer Xenon Chloride Excimer Laser Coronary Angioplasty ( ELCA ) system ( Advanced Interventional Systems , Inc . , Irvine , CA ) was performed .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None