This is a very intuitive App, simple and easy to use. DISCLAIMER This App is for reference only, please seek your doctor's advice in addition to using this App and before making any medical decisions. In addition, the efficiency of the above method is only about 90%, please consider carefully before using, we do not take any responsibility for your decision. We are very happy to serve you. If you have any requests, don't hesitate to contact us. - [email protected]