Apparatus and methods are described including identifying a subject as suffering from a condition selected from the group consisting of: cardiac dysfunction, congestive heart failure, reduced renal blood flow, increased renal vascular resistance, arterial hypertension, and kidney dysfunction. A network connected device may transmit a set of data identifying the location of the device and an identifier unique to the device to a server. In addition, in the process of forming a sourcedrain of an NMOS transistor, at the same time, a low resistance region in an N-type polycrystalline silicon resistor is formed, while in the process of forming a sourcedrain of a PMOS transistor, at the same time, a low resistance region in a P-type polycrystalline silicon resistor is formed.