diff --git a/priority-pathogens.Rproj b/priority-pathogens.Rproj
index 8e3c2ebc..21a4da08 100644
--- a/priority-pathogens.Rproj
+++ b/priority-pathogens.Rproj
@@ -11,3 +11,7 @@ Encoding: UTF-8
 
 RnwWeave: Sweave
 LaTeX: pdfLaTeX
+
+BuildType: Package
+PackageUseDevtools: Yes
+PackageInstallArgs: --no-multiarch --with-keep.source
diff --git a/shared/lassa_functions.R b/shared/lassa_functions.R
index 8646f330..5f331d7e 100644
--- a/shared/lassa_functions.R
+++ b/shared/lassa_functions.R
@@ -232,13 +232,9 @@ metaprop_wrap <- function(dataframe, subgroup,
                              plot_pooled, sort_by_subg, plot_study, digits, colour, 
                              width, height, resolution){
   
-  stopifnot(length(unique(dataframe$parameter_unit[!is.na(dataframe$parameter_unit)])) == 1)#values must have same units
-  
-  dataframe <- dataframe %>% filter(!is.na(cfr_ifr_denominator)) %>% 
-                             filter(!(is.na(cfr_ifr_numerator)&is.na(parameter_value))) %>%
-                             mutate(cfr_ifr_numerator = case_when(
-                                    is.na(cfr_ifr_numerator) & !is.na(parameter_value) ~ round((parameter_value/100)*cfr_ifr_denominator),
-                                    TRUE ~ cfr_ifr_numerator))
+  dataframe <- epireview::filter_df_for_metaprop(dataframe, 
+                                            num_col = "cfr_ifr_numerator",
+                                            denom_col = "cfr_ifr_denominator")
   
   mtan <- metaprop(data = dataframe,
                    studlab = refs, 
diff --git a/src/lassa_severity/orderly.R b/src/lassa_severity/orderly.R
index f13ba349..94613470 100644
--- a/src/lassa_severity/orderly.R
+++ b/src/lassa_severity/orderly.R
@@ -17,6 +17,12 @@ library(png)
 library(grid)
 library(patchwork)
 library(gridExtra)
+if(packageVersion("epireview") < "1.1.3") {
+  error_msg <- 
+    paste("Please download the latest development version of epireview using:",
+          "devtools::install_github('mrc-ide/epireview@develop')")
+  stop(error_msg)
+}
 
 #orderly preparation 
 orderly_strict_mode()