A bi-directional dcdc power converter having a neutral terminal includes a first dc voltage terminal set and a second dc voltage terminal set. The invention also provides a method of treating a wound in a patient suffering from a wound which comprises administering a therapeutically effective amount of an oxandrolone to the patient. By including on each trace path two distinct inductance zones separated by a neutral zone, significant gains in degrees of freedom are achieved for designing PCB trace patterns in which a pair of inductive coupling zones jointly offset the inductive coupling caused by a specification plug and the jack contacts, both in magnitude and phase angle.