Which territories is the employee with a doctorate in charge of? List all of the territory descriptions.
with a doctorate refers to TitleOfCourtesy = 'Dr.'
SELECT T3.TerritoryDescription FROM Employees AS T1 INNER JOIN EmployeeTerritories AS T2 ON T1.EmployeeID = T2.EmployeeID INNER JOIN Territories AS T3 ON T2.TerritoryID = T3.TerritoryID WHERE T1.TitleOfCourtesy = 'Dr.'