Circumvention tourism is also an area of medical tourism that has grown. Circumvention tourism is travel in order to access medical services that are legal in the destination country but illegal in the home country. This can include travel for fertility treatments that aren't yet approved in the home country, abortion, and doctor-assisted suicide. Abortion tourism can be found most commonly in Europe, where travel between countries is relatively simple. Ireland and Poland, two European countries with highly restrictive abortion laws, have the highest rates of circumvention tourism. In Poland especially, it is estimated that each year nearly 7,000 women travel to the UK, where abortion services are free through the National Health Service. There are also efforts being made by independent organizations and doctors, such as with Women on Waves, to help women circumvent laws in order to access medical services. With Women on Waves, the organization uses a mobile clinic aboard a ship to provide medical abortions in international waters, where the law of the country whose flag is flown applies.