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He made his league debut on 6 October 2012 in a 1 – 0 Czech First League away win at FK Mladá Boleslav , against whom he also scored his first league goal on 21 April 2013 .
 Czech First League, FK Mladá Boleslav
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Czech First League, FK Mladá Boleslav