participant1:
  study_id: "Social-11"
  email: p1@example.com
  phone_number: "16305150171"
  contact_preference: sms

participant2:
  study_id: "Social-22"
  email: p2@example.com
  phone_number: "16305150172"
  contact_preference: sms

participant3:
  study_id: "Social-33"
  email: p3@example.com
  phone_number: "16305150173"
  contact_preference: email