RT Journal Article SR Electronic T1 Neonatal frequent premature ventricular contraction JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e254837 DO 10.1136/bcr-2023-254837 VO 16 IS 2 A1 Rie Chida A1 Kazuki Iio A1 Yu Ishida A1 Gaku Yamanaka YR 2023 UL http://casereports.bmj.com/content/16/2/e254837.abstract AB