Bignold JJ, Mercer JD, Antic NA, McEvoy RD, Catcheside PG Accurate position monitoring and improved supine-dependent obstructive sleep apnea with a new position recording and supine avoidance device. J Clin Sleep Med. 2011 Aug 15;7(4):376-83. doi: 10.566
Kuo TB, Chen CY, Hsu YC, Yang CC Performance of the frequency domain indices with respect to sleep staging. Clin Neurophysiol. 2012 Jul;123(7):1338-45. doi: 10.1016/j.clinph.2011.11.003. Epub 2011 Dec 5.
Kuo TB, Yang CC Frequency domain analysis of electrooculogram and its correlation with cardiac sympathetic function. Exp Neurol. 2009 May;217(1):38-45. doi: 10.1016/j.expneurol.2009.01.012. Epub 2009 Jan 31.
Murayama R, Kubota T, Kogure T, Aoki K The effects of instruction regarding sleep posture on the postural changes and sleep quality among middle-aged and elderly men: a preliminary study. Biosci Trends. 2011;5(3):111-9.
Sadeh A The role and validity of actigraphy in sleep medicine: an update. Sleep Med Rev. 2011 Aug;15(4):259-67. doi: 10.1016/j.smrv.2010.10.001. Epub 2011 Jan 14. Review.
Yang CC, Lai CW, Lai HY, Kuo TB Relationship between electroencephalogram slow-wave magnitude and heart rate variability during sleep in humans. Neurosci Lett. 2002 Aug 30;329(2):213-6.
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.