tokens: After excluding case reports , the following groups were constructed : ( a ) short - term administration , after valve insertion ( n = 212 ) ; ( b ) short - term , perioperative ( noncardiac ) / periprocedural ( n = 114 ) ; ( c ) long - term , due to intolerance to OAC ( n = 16 ) ; ( d ) long - term , in pregnancy ( n = 10 ) .