1、Effect of Xuezhikang on 80 CHD patients:an observational study
2、Ries said."This is an observational study using data from a large database.
3、Prospective observational study on the effec ts of caesarean section on breastfeeding
4、Clinieal efficacy of xueshuantong and erigeron injection on hypercoagulative status in nephrotic syndrome-an observational study
5、The smoking situation is taken from an observational study in early 2008.
6、Histopathologicly observational study of cartilage-mucosa on the eustachian tube isthmus of temporal bone with otitis media
7、Based on this observational study alone, the risk cannot be associated with certainty to the growth hormone treatment.
8、Last week, the Lancet published the combined results of a larger observational study, also led by Professor Rothwell.
9、Researchers cautioned that this was an observational study that does not necessarily carry the same scientific weight as a blinded clinical trial.
10、Since NHANES III was an observational study and not a clinical trial, no definite conclusions about cause and effect were possible, says Dr. Cohen.
11、According to observational study a method for analysis of isobaric surface patterns and sea-level pressure field in mountainous regions is developed in this paper.
12、But the authors acknowledged that they could not account for all possible variables, and cautioned that it was an observational study that draws no conclusions about cause and effect.
