However , certain circumstances made him depressed and disillusioned during his college days .
He still recounts how he knew complete Gray 's anatomy by heart and emphasizes his deep study of pathology which has proven useful for his research .
Certain circumstances made him depressed and disillusioned during his college days .
He still recounts how he knew complete Gray 's anatomy by heart and emphasizes his deep study of pathology which has proven useful for his research .