HEALTHVEST <HVT> DECLARES THREE-WEEK DIVIDEND Healthvest said its board declared a dividend for the final three weeks of the March quarter of 14 cts, payable April 28 to holders of recrod April 15. Previously, it dclared a special interim dividend of 42 cts for January 1 to March 9 in connection with its recently completed offering. The combined dividend totals 56 cts for the March quarter, an increase from the prior quarter's dividend of 55 cts