public SickEntry createSickEntry(Date from, int days)
	{
		try
		{
			manager.getTransaction().begin();
			SickEntry entry = new SickEntry(from, days);
			manager.persist(entry);
			manager.getTransaction().commit();
			
			return entry;
		}
		catch(PersistenceException e)
		{
			e.printStackTrace();
			manager.getTransaction().rollback();
			throw e;
		}
	}