Text this: In Elderly Patients With Antipsychotic-Induced Hyperprolactinemia, Could Switching to a Prolactin-Sparing Antipsychotic or Adding a Dopamine Agonist, Rather Than Maintaining the Current Regimen, Normalize the Prolactin Levels Without Triggering Psychotic Relapse or Increasing the Risk of Life-Threatening Adverse Events? A Systematic Review