The phrase "as demonstrated by several" is correct and usable in written English.
It can be used when referring to evidence or examples that support a statement or claim, indicating that multiple instances or sources validate the point being made.
Example: "The effectiveness of the new teaching method is evident, as demonstrated by several studies conducted over the past year."
Alternatives: "as shown by several" or "as evidenced by several".
For the lymphatic and hematogenous metastases, reasonably extended lymphadenectomy, regional radiotherapy, and adjuvant antitumor chemotherapy have been proved effective, as demonstrated by several large scale international studies such as INT-0116 theal, the MAGIC trial, and the ACTS-GC trial.
At the same time, he was well aware that there was something inherently silly about the whole premise, as demonstrated by several stories collected in GOING FOR INFINITY: A Literary Journey (Tor/Tom Doherty, $25.95), a sampling of his work originally published between 1950 and 1999.
"They still enjoy a quasi monopoly on salvation, as demonstrated by several crowded and unseaworthy boats leaving Libya even following the Lampedusa tragedy," Maurizio Albahari, a specialist in international migration at the University of Notre Dame, said in an e-mail.
Importantly, irradiated NK92 cells have been proven safe for infusion in patients, as demonstrated by several NK92 clinical trials (NCT00900809, NCT00990717, NCT00995137, and NCT01974479).
Of the three examined methods, one reveals to be particularly robust and accurate, as demonstrated by several tests discussed in Section 4.
Nowadays, it is well known that large instillation volumes may cause overestimation of IAP as demonstrated by several investigators [1, 24 27].
In this respect, the occurrence of nosocomial infections could be minimized thanks to deleukocytations of the RBCT, as demonstrated by several studies [49].
This approach is applicable in 2D as well as in 3D and provides very good numerical stability, as demonstrated by several experiments on real data.
During the past decades, interest in the geochemistry of groundwater has increased as demonstrated by several hydrogeochemical studies which are increasingly becoming a firm part of regional hydrogeological studies.
As demonstrated by several authors, if one employs interface modification into any device, it should, in principle, be possible to see some positive improvements as a result of the interface modification, regardless of active materials used.
However, as demonstrated by several authors [72] the probability of attaining therapeutic drug levels in ICU patients is low and variable depending on the antibiotic considered and dosing strategies [35].
