Disclosed is a method of diagnosing the presence of a malignant tumor, including a glioma, in a human subject, which involves detecting overexpression of laminin 4 subunit protein or laminin 4-specific MRNA, compared to the expression level in a normal tissue control. The piezoelectric drive has a laminate structure provided by a first electrode film contacting the movable portion and the fixed portion, a second electrode film and a piezoelectric film between the first and the second electrode films. A thermal transport element is arranged in the thermal gap formed between the coplanar wall and the interior wall. The neutral line connects the neutral point connecting portions of the phase windings of different phases together. A belt clip, which is releasably engaged with the holster, mounts the holster to a belt of an operator. In yet another embodiment the working and counter or counterreference electrodes are spaced from 100 to 200 \u03bcm apart.