18376
At baseline , which was prior to MPH treatment , and after two weeks of medication , investigators asked children and their parents or caregivers about adverse events using a symptom rating scale .
 Chemical: MPH
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: MPH