Techniques for calibrating measuring devices are provided. The shorter arm of said spring presses said lens against said holder, the longer arm is pressed to the circumferential mantle of said holder and secured in this position by a bent cutout. An inverter input of an inverter is coupled to the output of the first amplifier. The frequency scaling factor corresponds to the frame rate of the output frames. Positioning the camera is accomplished by pulling on andor releasing the exit cable. Methods of providing hormone replacement therapy and for treating carcinomas, dysfunctional bleeding, uterine leiomyomata, endometriosis, and polycystic ovary syndrome is provided which includes delivering a compound of formula I and a selective estrogen receptor modulator are also described.