How many neighborhoods have a station proposed at a Hospital?
CREATE TABLE "planned_or_proposed_stations" (
  "station" text,
  "extension" text,
  "city_neighborhood" text,
  "projected_opening" text,
  "park_and_ride" text,
  "funded_by_st2" text
);
SELECT COUNT("city_neighborhood") FROM "planned_or_proposed_stations" WHERE "station"='Hospital';