"[A] requirement that abortions be performed in hospitals may “force women to travel to find available facilities, resulting in both financial expense and additional health risk,” and thereby may “significantly limit a woman’s ability to obtain an abortion” by “impos[ing] heavy, and unnecessary, burden on women’s access to a relatively inexpensive, otherwise accessible, and safe abortion procedure.” As a consequence, some women will be unable to get abortions at all. What the state cannot do to all women, it cannot do to poor women. If government may not increase the cost of abortion directly, it may not do so indirectly-not, at least, without compensating those whom its action would otherwise render unable to afford abortions."