After a participant has been assigned with a device number, sales representatives of BiometÒ Australia will fit them with it within three working days, in either the hospital ward or the participant’s home. Participants will receive instructions on how to use the device, and be required to wear the device for ten hours per day for a period of twelve weeks. The devices are manufactured to record the amount of time in which they have been used and thereby measure compliance. Non-compliance will be defined as average use of less than six hours per day. Participants will also be asked at twelve weeks about their average use of the device.