|Anemia occurs when the blood lacks enough healthy red blood cells which lower the capacity of blood to carry oxygen. Symptoms of this condition are tiredness, weakness, shortness of breath, pale colour of skin. There are more than 400 types of anaemia, among which the most common is Iron-deficiency anemia. Scholarly peer review is the process of subjecting an author's scholarly work, research, or ideas to the scrutiny of others who are experts in the same field, before a paper describing this work is published in a journal. The work may be accepted, considered acceptable with revisions, or rejected. Peer review requires a community of experts in a given (narrowly defined) field, who are qualified and able to perform reasonably impartial review.