fix(mimic-iv): do not treat CANCELLED cultures as positive

suspicion_of_infection marked any non-empty org_name as positiveculture
except NEGATIVE (90856). CANCELLED (90760) is not organism growth; exclude
it (and the CANCELLED label) so positive_culture stays accurate.

Fixes #1677

Author: acnimma

mimic-iv/concepts/sepsis/suspicion_of_infection.sql

@@ -30,12 +30,13 @@ WITH ab_tbl AS (
         , CAST(MAX(chartdate) AS DATE) AS chartdate
         , MAX(charttime) AS charttime
         , MAX(spec_type_desc) AS spec_type_desc
-        -- identify negative cultures as NULL organism
-        -- or a specific itemid saying "NEGATIVE"
+        -- non-positive: NULL/empty organism, NEGATIVE (90856),
+        -- or CANCELLED culture (90760) — cancelled is not growth
         , MAX(
             CASE WHEN org_name IS NOT NULL
-                      AND org_itemid != 90856
+                      AND org_itemid NOT IN (90856, 90760)
                       AND org_name != ''
+                      AND org_name != 'CANCELLED'
                 THEN 1 ELSE 0
             END) AS positiveculture
     FROM `physionet-data.mimiciv_hosp.microbiologyevents`

mimic-iv/concepts_duckdb/sepsis/suspicion_of_infection.sql

@@ -24,7 +24,10 @@ WITH ab_tbl AS (
     MAX(spec_type_desc) AS spec_type_desc,
     MAX(
       CASE
-        WHEN NOT org_name IS NULL AND org_itemid <> 90856 AND org_name <> ''
+        WHEN NOT org_name IS NULL
+        AND NOT org_itemid IN (90856, 90760)
+        AND org_name <> ''
+        AND org_name <> 'CANCELLED'
         THEN 1
         ELSE 0
       END

mimic-iv/concepts_postgres/sepsis/suspicion_of_infection.sql

@@ -22,10 +22,13 @@ WITH ab_tbl AS (
     MAX(hadm_id) AS hadm_id,
     CAST(MAX(chartdate) AS DATE) AS chartdate,
     MAX(charttime) AS charttime,
-    MAX(spec_type_desc) AS spec_type_desc, /* identify negative cultures as NULL organism */ /* or a specific itemid saying "NEGATIVE" */
+    MAX(spec_type_desc) AS spec_type_desc, /* non-positive: NULL/empty, NEGATIVE (90856), CANCELLED (90760) */
     MAX(
       CASE
-        WHEN NOT org_name IS NULL AND org_itemid <> 90856 AND org_name <> ''
+        WHEN NOT org_name IS NULL
+        AND NOT org_itemid IN (90856, 90760)
+        AND org_name <> ''
+        AND org_name <> 'CANCELLED'
         THEN 1
         ELSE 0
       END