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Our aim was to observe if patients with panic disorder ( PD ) and patients with major depression with panic attacks ( MDP ) ( Diagnostic and Statistical Manual of Mental Disorders , Fourth Edition criteria ) respond in a similar way to the induction of panic attacks by an oral caffeine challenge test .
 Disease: panic disorder; Disease: PD; Disease: major depression; Disease: panic attacks; Disease: MDP; Disease: Mental Disorders; Disease: panic attacks; Chemical: caffeine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: panic disorder; Disease: PD; Disease: major depression; Disease: panic attacks; Disease: MDP; Disease: Mental Disorders; Disease: panic attacks; Chemical: caffeine