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+====== Letter ======
+==== Letter (Scientific Publication) ====
+**Definition:** A *Letter* in scientific journals is a brief, peer-reviewed communication typically used to present **preliminary findings**, **novel observations**, **hypotheses**, or **comments** on previously published work.
+=== Characteristics ===
+  * Short format (usually 500–1500 words)
+  * No abstract (in most cases)
+  * Limited number of tables or figures (often 1–2)
+  * Few references
+  * Peer-reviewed, often with expedited review
+  * Does not include full methodology or detailed statistical analysis
+=== Common Types ===
+  * Preliminary research results
+  * Brief case reports or case series
+  * New clinical or physiological observations
+  * Hypothesis proposals
+  * Commentary or critique on previous publications
+=== Note ===
+Letters may also be referred to as:
+  * ''Short communications''
+  * ''Brief reports''
+  * ''Correspondence''
+Despite their brevity, letters are **indexed and citable** in databases such as PubMed and may have significant academic value.
+----
 see [[Referral Letter]]