Delivery of health information to a patient suffering from a chronic condition is personalized by displaying the health information directly on a customized image of a body. An amorphous silicon bearing substrate is located in an SLS apparatus. The user-interface unit has means for providing a user with an indication of a surface characteristic measured by the sensor. According to one embodiment, this scheme works on both positive and negative integers and encodes lower order integers with a smaller length of codeword. This embedded electrode serves to electrically lead the electrode pad to the principal surface on the bottom side of the silicon semiconductor substrate.