Cocoa oils containing phytosterols and tocols are prepared by extracting the cocoa hulls from dried unfermented or fermented cocoa beans, micronized cocoa beans, or roasted beans with a solvent such as petroleum ether and then removing the solvent. The column redundancy apparatus further includes a fuse information storage device, a first bank address decoding mechanism decodes a read bank address corresponding to a first micro-cell accessed for a read operation, and a second bank address decoding mechanism decodes a write bank address corresponding to a second micro-cell accessed for a write operation. An electrical impedance measurement circuit is electrically connected to the left ventricular lead port and the housing electrode. A feature is etched only partially into the substrate material using the hard mask layers with the feature pattern therein as a mask. Further, the first and second convection fans are driven by a single common driving unit.