Analysis 1.1. Comparison 1 benzydamine mouthwash versus placebo, Outcome 1 Improvement in mucositis.. .. Analysis 2.1. Comparison 2 low level laser versus sham, Outcome 1 Mild to moderate mucositis.. .. .. .. Analysis 3.1. Comparison 3 sucralfate versus placebo/salt and water/salt and soda, Outcome 1 Mucostis eradicated.. Analysis 4.1. Comparison 4 morphine (PCA) versus morphine (CI), Outcome 1 Average pain score.. .. .. . Analysis 4.2. Comparison 4 morphine (PCA) versus morphine (CI), Outcome 2 Daily mean opiate intake per hour. Analysis 4.3. Comparison 4 morphine (PCA) versus morphine (CI), Outcome 3 Duration of pain control.. .. .