McLoughlin G Interventions during pregnancy to prevent preterm birth: An overview of Cochrane systematic reviews. Res Nurs Health. 2020 Apr;43(2):206-207. doi: 10.1002/nur.22005. Epub 2019 Dec 20. No abstract available.
Nakhleh MK, Haick H, Humbert M, Cohen-Kaminsky S Volatolomics of breath as an emerging frontier in pulmonary arterial hypertension. Eur Respir J. 2017 Feb 23;49(2):1601897. doi: 10.1183/13993003.01897-2016. Print 2017 Feb.
Wallace MAG, Pleil JD Evolution of clinical and environmental health applications of exhaled breath research: Review of methods and instrumentation for gas-phase, condensate, and aerosols. Anal Chim Acta. 2018 Sep 18;1024:18-38. doi: 10.1016/j.aca.2018.01.069. Epub 2018 Feb 9.
Feasibility Study of the Collection of the Breath Metabolome From Healthy Parturients During Labor
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.
