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S jon: all right, the doctor is in. we know trees, lights, wrapping paper are a key parts of the christmas holiday but yes they can also be dangerous. how can you avoid setting your house or someone elses on fire? lets get some safety tips now from dr. ernest patti, senior attending physician of emergency medicine at st. barnabas hospital here in new york city. >> thanks, jon. jon: i imagine you have seen your share of christmas injuries? >> he definitely have. i like to remember in five ways, t...