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MATERIALS AND METHODS : We conducted a prospective surveillance study on patients diagnosed with pulmonary hypertension at 12 large referral centers in North America .
 Disease: pulmonary hypertension
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: pulmonary hypertension