Lam PM, Lai CK The validation of the Chinese version of the Swallow Quality-of-Life Questionnaire (SWAL-QOL) using exploratory and confirmatory factor analysis. Dysphagia. 2011 Jun;26(2):117-24. doi: 10.1007/s00455-010-9272-6. Epub 2010 Mar 4.
Tang Y, Shen Q, Wang Y, Lu K, Wang Y, Peng Y A randomized prospective study of rehabilitation therapy in the treatment of radiation-induced dysphagia and trismus. Strahlenther Onkol. 2011 Jan;187(1):39-44. doi: 10.1007/s00066-010-2151-0. Epub 2010 Dec 10.
van der Molen L, van Rossum MA, Burkhead LM, Smeele LE, Rasch CR, Hilgers FJ A randomized preventive rehabilitation trial in advanced head and neck cancer patients treated with chemoradiotherapy: feasibility, compliance, and short-term effects. Dysphagia. 2011 Jun;26(2):155-70. doi: 10.1007/s00455-010-9288-y. Epub 2010 Jul 11.
Wang TG, Chang YC, Chen WS, Lin PH, Hsiao TY Reduction in hyoid bone forward movement in irradiated nasopharyngeal carcinoma patients with dysphagia. Arch Phys Med Rehabil. 2010 Jun;91(6):926-31. doi: 10.1016/j.apmr.2010.02.011.
Wu CH, Hsiao TY, Ko JY, Hsu MM Dysphagia after radiotherapy: endoscopic examination of swallowing in patients with nasopharyngeal carcinoma. Ann Otol Rhinol Laryngol. 2000 Mar;109(3):320-5.
Swallowing Exercises for Patients With Nasopharyngeal Cancer After Radiation Therapy
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
