Since randomised interventions are difficult to achieve, the methods used are mainly indirect.
Since randomised trials on the effectiveness of this intervention are lacking, the PINE Preventionn by epidural Injection of postherpetic Neuralgia in the Elderly) study was set up.
Since randomised trials on the effectiveness and the cost-effectiveness of a single epidural injection of steroids and local anaesthetics are lacking, the PINE Preventionn by epidural Injection of postherpetic Neuralgia in the Elderly) study was set up.
Since, randomised control trials (RCTs) have high internal validity, in this paper we review RCTs of interventions involving CHWs for improving child health in LMIC from a realist perspective with the aim to see if the RCTs can yield insight into the working of the CHWs.
Unfortunately, the literature on TMJ surgery is based more on observation than science since randomised clinical trials comparing surgical treatment of the TMJ with medical treatment and no treatment (i.e., placebo) do not exist.
The scheme is controversial, however, since randomised trial evidence does not show that health checks reduce morbidity or mortality.
The use of radiation therapy has increased dramatically since randomised trials in the 1980s showed equivalent outcomes for patients treated with breast conserving surgery and radiation therapy and those treated with modified radical mastectomy [ 3- 5].
Loss to follow-up may reflect the clinical nature of patients with substance use admitted to a psychiatric emergency unit, and conducting studies in this field can be challenging though not less important since randomised controlled trials on these patients are still few [ 24, 25].
