Thank you for your interest in this study. If you are the parent of a child with CRPS, please answer this survey on behalf of your child to determine their study eligibility. If you have been diagnosed with CRPS and are interested in joining our study, please answer the following questions to determine your eligibility. If you have any questions, please contact the study's principal investigator, Dr. Andrew Dinh, at atdinh@stanford.edu.

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* 1. Do you (the potential study participant) currently reside in the US?

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* 2. Have you (the potential study participant) been diagnosed with complex regional pain syndrome?

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* 3. Are you (the potential study participant) between 10-18 years of age?

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* 4. Do any household members have an iPhone?

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* 5. Are you (the potential study participant) participating in any other research studies that involve wearing a wrist worn device?

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* 6. What is your first and last name?

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* 7. At what email address would you like to be contacted?

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* 8. At what phone number would you like to be contacted?

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* 9. What is your preferred method of contact?

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* 10. Do you have any questions or comments about the study?

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