“…Fourteen studies were retrospective ( 4,7,8,(10)(11)(12)14,15,17,19,21,22,24,25 ) and seven were prospective studies ( 5,6,9,13,16,18,20 ). Th ere were four studies from the United States ( 5,12,17,22 ), three from Canada ( 15,20,21 ), ten from Europe (6)(7)(8)(9)(10)(11)13,16,18,19 ), three from South-Korea ( 14,24,25 ), and one from New Zealand ( 4 ). Mean age of the study populations varied from 50.4 to 70.0 years ( 4,6,10,14-21,24,25 ) (median age, 57 to 75 years ( 5,9,13,16,21 )); 51.5% were males (4)(5)(6)…”