Sentence examples for but only three studies from inspiring English sources

There were significant differences in the effects of serum ferritin and serum copper, but only three studies of each outcome used tablets, and they were highly heterogeneous.

Results from several trials of vitamin D3 supplementation report reduced risk of infection, but only three studies have reported statistically significant findings [ 12- 21].

Upregulation of MCTs has been described in several tumour types, but only three studies have evaluated its clinicopathological significance (Pinheiro et al, 2008a, 2008b, 2009).

Owing to an interest in vaccine development, the infectivity of B. pertussis has been evaluated in many animal models, but only three studies in the mouse model met the data selection criteria.

Mother working outside the home was the second variable most commonly evaluated in Brazil (in 17 studies) [ 20], but only three studies identified it as a determinant of shorter duration of EBF [ 36- 38].

More than 60 linkage studies for obesity-related traits were published in the 2006 update of the Obesity Map [ 47], but only three studies involved pedigrees with children or adolescents [ 48- 50].

There have been many palaeoflood analyses worldwide [40] but only two studies specific to Southeast Asia [41,42].

The initial search yielded 85 papers, but only eight studies met the inclusion criteria.

Of 304 studies identified, 55 texts warranted detailed review, but only nine studies met eligibility criteria for inclusion.

Considering the statistical validity, all studies applied appropriate statistical tests, but only two studies [31,39] calculated the effect size to estimate the effect of the intervention-induced tendon adaptations.

In their review on the literature concerning SMBG, they found 1572 citations, but only six studies were considered as appropriate for further analysis [13] [18].