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Dedication Dedicated to my mentor, Prof. N.K. Jain, who helped me grow personally and profes- sionally; to mymother, Mrs. Kamal Shri Jain, who always encouraged and motivated me; to my husband, Mr. Vineet Kumar Jain, who always inspired my dedication to research; tomy sister, Dr. Anubha Jain, for her continuous support and care despite her busy sched- ule; to my beloved son, Kritansh; and to my whole family, for their unconditional love and support. Keerti Jain Dedication