Pain, like death, is a universal phenomenon. The sour grimace on the woman's face, registering her bodily complaints to Dr. G.P. Dureja in his East Delhi office, would be recognized anywhere. Slouched shoulders, pinched forehead. She wore a willowy black kurta and cast a disapproving glance at the five pain physicians-in-training huddled behind Dureja, founder of Delhi Pain Management Centre and one of India's pioneering pain physicians.