An express.js application that allows sending of SMS messages to the user and to create a conversation with the user. The app is based on the Twilio API (https://www.twilio.com).
Click here to watch the demonstration of the application.
The user is able to enroll in the app by texting START to his/her study text number. The app provides the required validation to ensure the user is not re-enrolled if already enrolled in the app. Upon enrolling in the app for the first time, the user gets the message "Welcome to the study".
After enrolling in the study the user gets the following message: "Please indicate your symptom (1)Headache, (2)Dizziness, (3)Nausea, (4)Fatigue, (5)Sadness, (0)None"
The user is only allowed to enter a number 0-5. If the user sends a message, not in this range it sends the user a message: "Please enter a number from 0 to 5" If the user enters 0, then send them this message "Thank you and we will check with you later." and stops messaging for this user.
After answering the symptom selection message the user will be asked to rank their symptom "On a scale from 0 (none) to 4 (severe), how would you rate your "XXXX" in the last 24 hours?", where "XXXX" is the symptom they selected in the first message. The user is only allowed to enter a number 0-4. If the user sends a message, not in this range you it sends the user a message: "Please enter a number from 0 to 4"
After answering the rating question the user gets a follow-up message based on the rating level they selected: if 1 or 2: then it sends "You have a mild XXXX" where XXXX is the symptom. if 3: then it sends "You have a moderate XXXX" where XXXX is the symptom. if 4: then send "You have a severe XXXX" where XXXX is the symptom. if 0: then it sends "You do not have an XXXX"
After answering the rating question Step 1 is repeated, the symptom question is sent to the user 3 times. The app drops the choices that were selected previously by the user. For example, if the user picked Headache as a symptom, then the message will be: "Please indicate your symptom (1)Dizziness, (2)Nausea, (3)Fatigue, (4)Sadness, (0)None" After the third time, the following message is sent to the user: "Thank you and see you soon"