UPDATE 1-AstraZeneca boosts respiratory unit with $575 mln Takeda deal
(Adds further details) LONDON, Dec 16 (Reuters) - Britain's AstraZeneca has agreed to buy Takeda Pharmaceutical's respiratory business, including expanded rights to roflumilast, a treatment for chronic obstructive pulmonary disease (COPD). AstraZeneca, which has marketed roflumilast i
