"It never rains in Cali..." you hum to yourself. After a well-deserved two-week vacation in Bali, you feel recharged and ready to face the day-to-day stress of your job.

Your pager buzzes—a new patient has arrived. Hurrying over, you are introduced to 72-year-old Susan. After formally introducing yourself, you ask her why she came in today. “Oh, doctor—my leg has been swollen for the last few days,” she responds.