Astellas has made personnel changes in the Americas related to its focus on international markets, while also building new corporate affairs and corporate development functions.   Percival Barretto-Ko has been appointed to the new position of senior vice president, International Operations. Mr. Barretto-Ko will oversee Astellas Pharma Canada, Inc. and Astellas Pharma Latin America, and will lead efforts to strengthen its presence in these regions. He previously served as senior vice president, C...