There are multiple definitions:

1. paroxysmal noctural hemoglobinuria(English)

   • Urology

2. perinatal mortality(English)

   • stillbirths and deaths within the first week of life
   • PNMR, PNMM
   • Neonatal situation, Prognosis
   • https://doi.org…12.2012.01478.x

3. persistent non-myopia(English)

   • HD, OCT, SFCT
   • Ophthalmology, Pediatrics
   • https://doi.org…67/iovs.65.3.17