Background Data for front-line health-care workers and risk of COVID-19 are limited. We
sought to assess risk of COVID-19 among front-line health-care workers compared with the …

Reports of long-lasting coronavirus disease 2019 (COVID-19) symptoms, the so-called ‘long
COVID’, are rising but little is known about prevalence, risk factors or whether it is possible …

Background and aims Acute appendicitis (AA) is among the most common causes of acute
abdominal pain. Diagnosis of AA is still challenging and some controversies on its …

It has long been recognized’that there are many reactions which can be promoted by light-activated
solids which are not consumed in the overall reaction; such solids are often referred …

Background The impact of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
on postoperative recovery needs to be understood to inform clinical decision making during …

Biodiversity hotspots have a prominent role in conservation biology 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ,
9 , but it remains controversial to what extent different types of hotspot are congruent 4 , 10 , …

Using data from selected areas in five UK cities, we studied the relationships between
urban form and the following measures of ecosystem performance: availability and patch …

Epidural analgesia is considered by many to be the best method of pain relief after major
surgery. It is used routinely in many thoracic surgery centres. Although effective, side-effects …

Green spaces play a crucial role in supporting urban ecological and social systems, a fact
recognised in public policy commitments in both the UK and Europe. The amount of provision, …

Metagenomic assembly enables new organism discovery from microbial communities, but it
can only capture few abundant organisms from most metagenomes. Here we present …