This study will use competitive enrollment. This means that when a target number of subjects has entered the treatment phase of the study, all further screening of subjects will be closed. The length of the study is based on an ongoing review of study results. The participation will last a maximum of 9 years and will include a maximum 28 visits to the study center. Telephone contact will be made every 2 months for subjects who have discontinued the study drug for any reason, but who are asked to continue in the study to be followed for potential cardiovascular events. This study design is called a "Time to Event Study". All study subjects will continue to be followed until enough information has been gathered to determine the overall safety of the study drug.