The present invention is a composition useful as an impact modifier for polyamide compositions. Sensor data associated with one or more symptoms of heart failure are acquired and trended. According to one method, a service generates executable code based on the piece of clinical knowledge. The outer housing may comprise three shells that telescopically interfit and that can be welded with circumferential welds. The carrying case comprises a first compartment having a locking mechanism. The etching operation is performed in such a way that the opening is formed with an overhang.