Publications by authors named "Chelim Cheong"

Background: Herpes zoster (HZ) vaccination is not publicly funded in Korea. This study aimed to assess the cost-effectiveness of introducing recombinant zoster vaccine (RZV) and zoster vaccine live (ZVL) into Korea's national immunization program (NIP).

Methods: A decision tree Markov model was used to estimate expected costs and quality-adjusted life years (QALYs) by comparing the lifetime cost-effectiveness of NIP vaccination strategies with RZV and ZVL to that of voluntary ZVL vaccination.

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This study presents a framework for determining the prioritization of vaccine introduction in the National Immunization Program (NIP) of the Republic of Korea, with a focus on case examples assessed in 2021 and 2023. We describe the predefined criteria for evaluating the prioritization of vaccines in the NIP and the established process in the Republic of Korea. These criteria included disease characteristics, vaccine characteristics, rationality and efficiency of resource allocation, and the acceptance of immunization.

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Inhaled corticosteroids are known to be relatively safe for long-term use in inflammatory respiratory diseases and it has been repurposed as one of the potential therapies for outpatients with coronavirus disease 2019 (COVID-19). However, inhaled corticosteroids have not been accepted for COVID-19 as a standard therapy because of its lack of proven benefits. Therefore, this study aimed to evaluate the effectiveness of inhaled corticosteroids in patients with COVID-19.

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Background: Human papillomavirus (HPV) infection is a major global disease burden and the main cause of cervical cancer. Certain HPV genotypes, with are the most common etiologic pathogens and cause a significant disease burden, are being targeted for vaccine development. However, few studies have focused on the comparative effectiveness of the bivalent HPV (2v-HPV), quadrivalent HPV (4v-HPV), and nonavalent HPV (9v-HPV) vaccines against HPV strain-specific infection.

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This study evaluated the efficacy and safety of neutralizing monoclonal antibodies (mAbs) with usual care in patients with coronavirus disease 2019 (COVID-19). Randomized controlled trials comparing the efficacy and safety of neutralizing mAb treatment in patients with COVID-19 were identified using electronic database searches through March 10, 2023. This systematic review was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines.

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Objectives: To relieve the financial burden faced by households, the Korean National Health Insurance (NHI) system introduced a "copayment ceiling," which evolved into a differential ceiling in 2009, with the copayment ceiling depending on patients' income. This study aimed to examine the effect of the differential copayment ceiling on financial protection and healthcare utilization, particularly focusing on whether its effects varied across different income groups.

Methods: This study obtained data from the Korea Health Panel.

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Objectives: Specialty drugs can bring significant benefits to patients, but they can be expensive. Medicare Part D plans charge relatively high cost-sharing costs for specialty drugs. A provision in the Affordable Care Act reduced cost sharing in the Part D coverage gap phase in an attempt to mitigate the financial burden of beneficiaries with high drug spending.

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Objectives: The recent arrival of new hepatitis C virus (HCV) drugs has brought fiscal pressures onto Medicare Part D; spending on HCV drugs in Part D jumped from $283 million in 2013 to $4.5 billion in 2014. We examined the current benefit designs for HCV drugs in Part D plans and analyzed patients' financial burden for those drugs.

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Objectives: Despite the clinical and epidemiological importance of herpes zoster (HZ) and postherpetic neuralgia (PHN), their disease and economic burden related to immune status has not been studied in South Korea. Our aim was to calculate the prevalence and rate of healthcare utilization related to HZ and PHN among Korean patients stratified by immune status.

Methods: This retrospective study used the Health Insurance Review and Assessment Service National Patients Sample (HIRA K-NPS) database, which includes all medical claims from January to December 2009 on a representative sample of the Korean population.

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Glucosamine and chondroitin are widely used as pharmaceutical and dietary supplements. However, there is a lack of information regarding consumer consumption of glucosamine and chondroitin in the Republic of Korea. We investigated the prevalence and factors affecting the use of glucosamine products in the general population aged 40 years and older in the Republic of Korea.

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Background: Little is known about the potential for improved adherence with and cost savings of fixed-dose combination therapy (FDCT) products compared with analogous dual therapy for type 2 diabetes mellitus.

Objectives: The objectives of this study were as follows: (1) to describe patient adherence to various oral antidiabetic regimens (ie, dual therapy and FDCT); (2) to determine whether there is a difference in medication adherence between FDCT users and analogous dual-therapy users; and (3) to assess whether there is a difference in reimbursement amounts between an FDCT product and its individual components.

Methods: This study was a retrospective cohort analysis using the Texas Medicaid prescription claims database.

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