public static function retrieveByPKs($pks, PropelPDO $con = null)
 {
     if ($con === null) {
         $con = Propel::getConnection(CalendariovacunacionPeer::DATABASE_NAME, Propel::CONNECTION_READ);
     }
     $objs = null;
     if (empty($pks)) {
         $objs = array();
     } else {
         $criteria = new Criteria(CalendariovacunacionPeer::DATABASE_NAME);
         $criteria->add(CalendariovacunacionPeer::ID, $pks, Criteria::IN);
         $objs = CalendariovacunacionPeer::doSelect($criteria, $con);
     }
     return $objs;
 }