1. In case of a patient with severe pain and allergy of codeine and ASA, can I use meperidine only? Or would it be better to mix meperidine with acetaminophen?2. Can I choose all kinds of NSAIDs(Ibuprofen, naproxen, and ketoroloc) for pediatric patients? Or Is ibuprofen the only NSAIDs that is able to be used for them?