Publications by authors named "Leo Han"

Objective: To determine if willingness to use and concern with using hormonal contraception (HC) is associated with knowledge about HC.

Study Design: We conducted an online cross-sectional survey of self-identified women, US residents 18 and older using Amazon Mechanical Turk and ResearchMatch.org.

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Objectives: This study aimed to examine the association of body mass index (BMI, kg/m) with time to fetal expulsion for individuals undergoing medication abortion over 13 weeks.

Study Design: This is a retrospective cohort study of singleton pregnancies undergoing medication abortion >13 weeks at a single academic medical center between 2020 and 2024. Our primary outcome was time to fetal expulsion.

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Article Synopsis
  • CRUSE® is an app designed for people with chronic spontaneous urticaria (CSU) to track their symptoms using visual analogue scales (VASs), aiming to assess the app's effectiveness in measuring disease activity.
  • A study analyzed three VASs related to CSU impact on daily life, including one specifically for the severity of urticaria, one for productivity, and a general health measure (EQ-5D), using data from nearly 6,000 patients over many days.
  • The results showed that the CRUSE® app's VASs demonstrate strong validity and reliability, with the "VAS urticaria" being most effective in capturing symptom changes, while the minimal important difference (MID) values indicated meaningful changes
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Objective: Endocervical mucus production is a key regulator of fertility throughout the menstrual cycle. With cycle-dependent variability in mucus quality and quantity, cervical mucus can either facilitate or block sperm ascension into the upper female reproductive tract. This study seeks to identify genes involved in the hormonal regulation of mucus production, modification, and regulation through profiling the transcriptome of endocervical cells from the non-human primate, the rhesus macaque (Macaca mulatta).

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Objectives: Misperceptions about intrauterine devices (IUDs) may dissuade potential users and public beliefs are not well understood. We sought to describe public knowledge of mechanism of action, failure rate, and IUD health risks. Secondary objectives included identifying inaccurate information and information sources about IUDs.

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Background: Neck pain is a common condition that leads to neck motor dysfunction and subsequent disability, with a significant global health care burden. As a newly emerging tool, virtual reality (VR) technology has been employed to address pain and reduce disability among patients with neck pain. However, there is still a lack of high-quality studies evaluating the efficacy of VR therapy combined with conventional rehabilitation for patients with chronic neck pain, particularly in terms of kinematic function.

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Article Synopsis
  • Researchers wanted to see if getting a COVID-19 vaccine at different times during a woman's menstrual cycle affected how long her cycle was.
  • They looked at data from 19,497 women who tracked their cycles with an app and compared those who got the vaccine to those who didn't.
  • Results showed that women vaccinated during the early part of their cycle had longer periods on average, while those vaccinated later or not at all didn’t see any change.
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  • There’s a lot of misinformation out there that makes people think abortion is very dangerous for health, even though it’s actually safe.
  • The study wanted to find out what people really think are the risks of having an abortion, looking at both short-term and long-term effects.
  • They surveyed over 1,000 adults and found that most people thought the risks were much higher than what is actually known, especially for problems like bleeding and anxiety.
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Objective: Endocervical mucus production is a key regulator of fertility throughout the menstrual cycle. With cycle-dependent variability in mucus quality and quantity, cervical mucus can either facilitate or block sperm ascension into the upper female reproductive tract. This study seeks to identify genes involved in the hormonal regulation of mucus production, modification, and regulation through profiling the transcriptome of endocervical cells from the non-human primate, the Rhesus Macaque (Macaca mulatta).

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Background: Some users of the etonogestrel contraceptive implant experience bothersome bleeding, which can reduce contraceptive satisfaction and continuation. Few strategies exist to manage this bleeding. The exact mechanism of progestin-induced bleeding is unknown, but it is likely multifactorial (eg, impaired angiogenesis, "leaky" fragile vasculature, and inflammation).

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Article Synopsis
  • The study aimed to determine whether COVID-19 vaccination affects menstrual bleeding patterns among individuals with regular cycles using a fertility tracking app.
  • Involving 9,555 participants, results showed that most people experienced no changes in heavy bleeding days, regardless of vaccination status, and significant differences were not found between the groups after adjustments.
  • However, a slight increase in overall bleeding quantity was observed in vaccinated individuals after the first dose, but this effect diminished in subsequent cycles.
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Objective: To characterize ion channel expression and localization in the endocervix under different hormonal conditions using a nonhuman primate primary endocervical epithelial cell model.

Design: Experimental.

Setting: University-based, translational science laboratory.

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Objectives: To identify whether covid-19 vaccines are associated with menstrual changes in order to address concerns about menstrual cycle disruptions after covid-19 vaccination.

Design: Global, retrospective cohort study of prospectively collected data.

Setting: International users of the menstrual cycle tracking application, Natural Cycles.

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Objectives: To estimate the effects on cervical mucus, ovarian activity and theoretical contraceptive protection of a 6-hour delay and of missing one norgestrel 0.075 mg progestogen-only pill.

Study Design: In a prospective, two-site, randomized, crossover study, healthy women aged 18 to 35 with BMI <32.

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Objective: To determine if the secretions collected from a conditionally reprogrammed primary endocervical cell culture are suitable surrogates for mucus studies.

Design: Experimental.

Setting: University research center.

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The cystic fibrosis transmembrane conductance regulator (CFTR) is an apical membrane chloride/bicarbonate ion channel in epithelial cells. Mutations in CFTR cause cystic fibrosis, a disease characterized by thickened mucus secretions and is associated with subfertility and infertility. CFTR function has been well characterized in vitro and in vivo in airway and other epithelia studies.

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Objective: To evaluate the cervical mucus effects of a norgestrel 0.075 mg progestin-only contraceptive pill over a 28-day cycle.

Study Design: We recruited persons ages 18 to 35 with normal cycles at 2 US academic medical centers.

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Objective: To explore the effect on ovarian activity and ovulation of 28 days of correct daily use of a progestogen-only pill containing norgestrel 0.075 mg.

Study Design: We performed a prospective, randomized, crossover study at 2 US sites, recruiting healthy women of reproductive age to use norgestrel 0.

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Article Synopsis
  • A study was conducted to see if COVID-19 vaccination affects menstrual cycle or menses length by comparing vaccinated individuals with unvaccinated ones.
  • Researchers used a menstrual tracking app to analyze data from 3,959 U.S. residents aged 18-45, focusing on cycle lengths before and after vaccination versus those who remained unvaccinated.
  • The results showed a slight increase in cycle length (less than 1 day) for vaccinated individuals after the first and second doses, while unvaccinated individuals showed no significant changes; however, menses length appeared unaffected by vaccination.
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Purpose: Endocervical mucus changes play a key role in regulating fertility throughout the menstrual cycle and in response to hormonal contraceptives. Non-human primates (NHP) provide the most translational animal model for reproductive tract studies, as they have hormonally-regulated menstrual cycles and mucus changes, similar to women.

Experimental Design: We used TMT labelling and LC-LC/MS to compare the proteins found in the mucus of the rhesus macaque to the mucus of the human endocervix.

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Background: Most patients use the internet to search for health information. While there is a vast repository of searchable information online, much of the content is unregulated and therefore potentially incorrect, conflicting, or confusing. Abortion information online is particularly prone to being inaccurate as antichoice websites publish purposefully misleading information in formats that appear as neutral resources.

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Expanded legal access to cannabis in the United States has led to its increased use for treating medical conditions. We assessed the use of and attitudes toward cannabis for treating gynecological conditions. We utilized Amazon.

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