Researcher is fully aware of the ethical issues involved in this work. Responsibility for all procedures and ethical issues related to the project rests with the principal investigators. Research will be conducted in such a way that the integrity of the research enterprise will be maintained? and negative after-effects which might diminish the potential for future research were avoided. The choice of research issues will be based on the best scientific judgment and on an assessment of the potential benefit to the participants and society in relation to the risk to be borne by ...