Buysiders said they are hoping Credit Suisse First Boston and Bank of America will increase the $175 million "B" tranche on the $425 million credit launched for healthcare concern DaVita, Inc. two weeks ago. Buysiders said the "B" is oversubscribed as a result of a well structured credit and desire by buysiders to up their allocations to the sector. A buysider noted that the $250 million pro rata continues to struggle in the face of a tough pro rata market while the "B" blew out and the bond market, also hot for the sector, is reportedly offering a coupon of roughly 9 1/4% on the notes. Richard Whitney, cfo, was not available for comment by press time. Credit Suisse First Boston and Bank of America did not return calls.