Highly rated medical stocks DaVita (DVA) and Cardinal Health (CAH) are expected to report strong earnings this week. But profit at WellCare Health Plans (WCG) is expected to fall, on the heels of a warning from Humana (HUM), which missed estimates in its late-Monday earnings report and sent insurer stocks down. Analysts are expecting WellCare Health Plans to report a 32% decline in second-quarter EPS to $1.21 when it announces earnings on Friday.