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The " Yoga Journal " provides separate lists of asanas that it states are " inadvisable " and should be avoided or modified for each of the following medical conditions : asthma ; back injury ; carpal tunnel syndrome ; diarrhoea ; headache ; heart problems ; high blood pressure ; insomnia ; knee injury ; low blood pressure ; menstruation ; neck injury ; pregnancy ; and shoulder injury .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None