diff --git a/swad_attendance.c b/swad_attendance.c
index 27ea4e09e..f1f71eb78 100644
--- a/swad_attendance.c
+++ b/swad_attendance.c
@@ -134,7 +134,6 @@ static void Att_RemoveUsrFromAttEvent (long AttCod,long UsrCod);
 static void Usr_ListOrPrintMyAttendanceCrs (Att_TypeOfView_t TypeOfView);
 static void Usr_ListOrPrintUsrsAttendanceCrs (Att_TypeOfView_t TypeOfView);
 
-static void Att_GetListSelectedUsrCods (unsigned NumUsrsInList,long **LstSelectedUsrCods);
 static void Att_GetListSelectedAttCods (char **StrAttCodsSelected);
 
 static void Att_PutIconsMyAttList (void);
@@ -2767,9 +2766,10 @@ static void Usr_ListOrPrintUsrsAttendanceCrs (Att_TypeOfView_t TypeOfView)
 
    /***** Get list of selected students if not already got *****/
    Usr_GetListsSelectedUsrsCods ();
+   NumUsrsInList = Usr_CountNumUsrsInListOfSelectedEncryptedUsrCods ();
 
-   /* Check the number of students to list */
-   if ((NumUsrsInList = Usr_CountNumUsrsInListOfSelectedEncryptedUsrCods ()))
+   /***** Get list of users selected to show their attendance *****/
+   if (NumUsrsInList)
      {
       /***** Get boolean parameter that indicates if details must be shown *****/
       Gbl.AttEvents.ShowDetails = Par_GetParToBool ("ShowDetails");
@@ -2778,7 +2778,7 @@ static void Usr_ListOrPrintUsrsAttendanceCrs (Att_TypeOfView_t TypeOfView)
       Grp_GetParCodsSeveralGrpsToShowUsrs ();
 
       /***** Get list of students selected to show their attendances *****/
-      Att_GetListSelectedUsrCods (NumUsrsInList,&LstSelectedUsrCods);
+      Usr_GetListSelectedUsrCods (NumUsrsInList,&LstSelectedUsrCods);
 
       /***** Get number of students in each event *****/
       for (NumAttEvent = 0;
@@ -2820,7 +2820,7 @@ static void Usr_ListOrPrintUsrsAttendanceCrs (Att_TypeOfView_t TypeOfView)
       free (Gbl.AttEvents.StrAttCodsSelected);
 
       /***** Free list of user codes *****/
-      free (LstSelectedUsrCods);
+      Usr_FreeListSelectedUsrCods (LstSelectedUsrCods);
 
       /***** Free list of groups selected *****/
       Grp_FreeListCodSelectedGrps ();
@@ -2838,38 +2838,6 @@ static void Usr_ListOrPrintUsrsAttendanceCrs (Att_TypeOfView_t TypeOfView)
    Att_FreeListAttEvents ();
   }
 
-/*****************************************************************************/
-/********** Get list of students selected to show their attendances **********/
-/*****************************************************************************/
-
-static void Att_GetListSelectedUsrCods (unsigned NumUsrsInList,long **LstSelectedUsrCods)
-  {
-   unsigned NumUsr;
-   const char *Ptr;
-   struct UsrData UsrDat;
-
-   /***** Create list of user codes *****/
-   if ((*LstSelectedUsrCods = (long *) calloc ((size_t) NumUsrsInList,sizeof (long))) == NULL)
-      Lay_NotEnoughMemoryExit ();
-
-   /***** Initialize structure with user's data *****/
-   Usr_UsrDataConstructor (&UsrDat);
-
-   /***** Loop over the list Gbl.Usrs.Selected.List[Rol_UNK] getting users' codes *****/
-   for (NumUsr = 0, Ptr = Gbl.Usrs.Selected.List[Rol_UNK];
-	NumUsr < NumUsrsInList && *Ptr;
-	NumUsr++)
-     {
-      Par_GetNextStrUntilSeparParamMult (&Ptr,UsrDat.EncryptedUsrCod,
-                                         Cry_BYTES_ENCRYPTED_STR_SHA256_BASE64);
-      Usr_GetUsrCodFromEncryptedUsrCod (&UsrDat);
-      (*LstSelectedUsrCods)[NumUsr] = UsrDat.UsrCod;
-     }
-
-   /***** Free memory used for user's data *****/
-   Usr_UsrDataDestructor (&UsrDat);
-  }
-
 /*****************************************************************************/
 /****************** Get list of attendance events selected *******************/
 /*****************************************************************************/
diff --git a/swad_changelog.h b/swad_changelog.h
index c95871039..060676a91 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -487,7 +487,7 @@ enscript -2 --landscape --color --file-align=2 --highlight --line-numbers -o - *
 En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
-#define Log_PLATFORM_VERSION	"SWAD 19.66.4 (2019-11-13)"
+#define Log_PLATFORM_VERSION	"SWAD 19.66.5 (2019-11-13)"
 #define CSS_FILE		"swad19.47.css"
 #define JS_FILE			"swad19.65.js"
 /*
@@ -496,7 +496,8 @@ ps2pdf source.ps destination.pdf
 // TODO: Importante: filtrar proyectos por usuarios (igual que en trabajos o en asistencia)
 // TODO: Code refactoring in HTML h1, title, meta, video, p, iframe, input hidden, area
 
-	Version 19.66.5:  Nov 13, 2019	Filter projects by selected users. (? lines)
+	Version 19.66.6:  Nov 13, 2019	Filter projects by selected users. (? lines)
+	Version 19.66.5:  Nov 13, 2019	Code refactoring in list of users in attendance event. (246704 lines)
 	Version 19.66.4:  Nov 13, 2019	Code refactoring in list of users in attendance event. (246729 lines)
 	Version 19.66.3:  Nov 13, 2019	Filter projects by selected users. Not finished. (246656 lines)
 	Version 19.66.2:  Nov 13, 2019	Fixed bug in edition of test question. (246628 lines)