(Bloomberg) -- Novo Nordisk A/S diabetes drug Ozempic showed surprisingly early effectiveness in a kidney-failure study, sending shares of the world’s biggest dialysis providers tumbling.Most Read from BloombergIsrael Latest: Sirens Sound in North, Biden Speaks to NetanyahuIsrael Latest: Israeli Death Toll in Hamas Attack Reaches 1,200Israel Forms Emergency Government for War Against HamasHamas Got Around Israel’s Surveillance Prowess by Going DarkIMF Caught Off Guard as China Strikes Sri Lanka