Hi, I have a couple questions for patients who meet the Canadian Consensus criteria. This is just a general survey which may help a researcher focusing on aspects of research that is of interest to them. It may help formulate research question or hypothsis I will not keep tabs on who is who, i will simply collect numbers and deidentified data. (Patient 1, patient 2). You may decide to send a private message if you do not want to disclose these numbers publicly. The private message will be deleted once i have put the data in excel. 1) Age 2) Sex 3) how long sick 4) meet criteria for Canadian Consensus? (Yes or no) 5) BMI (can be calculated here ) 6) HDL (high density lipoprotein) please write down the unit and reference range as it may vary from country to country) 7) sitting blood pressure 8) Are you on any blood pressure medication 9) have you been diagnosed with POTS, OI, or NMH (specify which) Thank you.