A new method is found to determine an increased risk for side effects of an SSRI treatment in a person by genotyping the person for the presence of the 102 CC DNA sequence in the 5-HT2A receptor gene. A barrier film is formed in a device separating structure, and the device separating structure is etched at a predetermined thickness to expose a semiconductor substrate. Preferably, the header includes information corresponding to the length of the data signal.