The research involves few data indicators, and the included literature does not specify the control and treatment of selected asthma patients may bias the results.
The study involved fewer data indicators, and the inclusion of literature did not specify that the control and treatment of selected asthma patients may be biased in results.
There are few data indicators involved in the study, and the control and treatment of selected asthma patients are not specified in the included literature, which may have bias on the results.