Are these three article belong to quantitative? are they prospective or retrospective?

Question Are these three article belong to quantitative? are they prospective or retrospective? Calligaro, G. L., Lalla, U., Audley, G., Gina, P., Miller, M. G., Mendelson, M., … & Koegelenberg, C. F. (2020). The utility of high-flow nasal oxygen for severe COVID-19 pneumonia in a resource-constrained setting: A multi-centre prospective observational study. EClinicalMedicine, 28, 100570.Thibodeaux, K., Speyrer, M., Raza, A., Yaakov, R., & Serena, T. E. (2020). Hyperbaric oxygen therapy in preventing mechanical ventilation in COVID-19 patients: a retrospective case series. Journal of wound care, 29(Sup5a), S4-S8. https://doi.org/10.12968/jowc.2020.29.Sup5a.S4Teng, X., Shen, Y., Han, M., Yang, G., Zha, L., & Shi, J. (2021). The value of high‐flow nasal cannula oxygen therapy in treating novel coronavirus pneumonia. European Journal of Clinical Investigation, 51(3), e13435-n/a. https://doi.org/10.1111/eci.13435 Health Science Science Nursing NURS 5366 Share QuestionEmailCopy link Comments (0)