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WHO'nun 2019 kılavuzu 6 ay ibaresi yok https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://apps.who.int/iris/bitstream/handle/10665/335902/9789240011809-eng.pdf&ved=2ahUKEwjB8ZTurrGBAxUpVfEDHT1tCL4QFnoECCUQAQ&usg=AOvVaw3v-O2xEUvHy7SUhE6b8ohb
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