Systematic Review of The PICO Method Regarding The Effectiveness The Effectiveness of Giving Guava Juice (Psidium guajava) Women In Increasing Hemoglobin Levels. nuscientech [Internet]. 2024 Aug. 3 [cited 2025 Apr. 24];2024(43):98-100. Available from: https://nstproceeding.com/index.php/nuscientech/article/view/1262