Your participation is voluntary and if you do not wish to take part or be sent reminders then please reply to the invitation email and your details will be removed from the research project.
Mae eich cyfranogiad yn wirfoddol ac os nad ydych am gymryd rhan neu gael eich atgoffa, atebwch yr e-bost gwahoddiad a bydd eich manylion yn cael eu tynnu o'r prosiect ymchwil.