As a result of the study, the study was conducted in the first half of the century, and in the second half of the century the study was conducted in the second half of the century, and in the second half of the century the study was conducted in the second half of the century, and in the second half of the century the study was conducted in the second half of the century, and in the second half of the century the study was conducted in the second half of the century, and in the second half of the century the study was conducted in the second half of the century and in the second half of the century the study was conducted in the second half of the century.