http://www.wrongdiagnosis.com/p/postural_orthostatic_tachycardia_syndrome/intro.htm
http://www.nymc.edu/fhp/centers/syncope/POTS.htm#top
http://www.dinet.org/
http://www.ninds.nih.gov/disorders/postural_tachycardia_syndrome/postural_tachycardia_syndrome.htm
http://www.ucsfhealth.org/childrens/medical_services/heart_center/arrhythmia/conditions/syncope/diagnosis.html
http://www.hrtcare.com/neurosyn.asp
http://www.righthealth.com/Health/neurocardiogenic%20syncope-s?lid=goog-ads-sb-0642011240&gclid=CL7fzrf0j5ECFQNxHgodvTG-Aw