Sentence examples for several studies have been investigated from inspiring English sources

Several studies have been investigated the use of natural materials for ZnO nanoparticles synthesis such as DNA [12], silk [13], albumen [14], orange juice [15], pea starch [16], peptide structures [17] and etc.

Several studies have been published investigating not only wage differentials but also labour mobility between sectors (Maloney, 1999; Maloney, 2004; Bosch & Maloney, 2007; Bosch & Maloney, 2008).

20 Several studies have been published investigating patient adherence to capecitabine.

Several studies have been published investigating healthcare provider and patient attitudes towards different methods of HD care and delivery, including home HD [ 37, 40- 42].

Several studies have been conducted investigating the association between male pattern baldness (as a proxy for testosterone levels) and various health issues such as prostate cancer [ 3- 7] and cardiovascular disease[ 6, 8, 9].

Several studies have been undertaken investigating the role of KLK genetic variants in different cancers, aiming to better understand cancer biology and also to identify potential new targets for genetic testing with regard to cancer risk and prognosis [ 14- 17].

32 Several studies have been performed that investigated the use of CTG combination therapy vs using two separate medications each day (Table 1).