cluster-randomized trial

On a weekday morning in Kampala, the city snarls without any signs of awakening. Cars grind bumper to bumper along crumbling asphalt, their horns locked in a long, impatient argument. Rusting taxis and private vehicles shudder under the rising sun. Boda bodas slice through impossibly narrow gaps, mount pavements, edge past crossings, and assert dominance […]