Feb. 28 (UPI) -- Pope Francis , who has been hospitalized for two weeks with double pneumonia, is continuing to improve, according to the Vatican, which said he spent Thursday alternating between high-flow oxygen therapy and a Ventimask. "The Holy Father's clinical condition has continued to improve during the day," the Vatican said in a statement . Advertisement "In view of the complexity of the clinical picture, further days of clinical stability will be needed in order to determine the