The present invention is directed to the preparation of photoresist polymers via living free radical polymerization techniques. Uncalibrated or calibrated cardiac ejection fraction may be calculated from estimates of stroke volume and the ventricular compliances. The vertical JFET also includes a plurality of regrown epitaxial layers coupled to the distal epitaxial layer and disposed in at least a portion of the gap. The data signal is in a first state when the first scan signal is in a pre-charged period. By arranging a composite diffraction element close to the diode laser, which element has a first diffraction structure, for combining the HD beam and the LD beam, and a second diffraction structure, which acts as a lens for either the LD beam or the HD beam only, a compact device is obtained, which is suitable for writing the LD information layer.