diff --git a/smash/web/forms/study_subject_forms.py b/smash/web/forms/study_subject_forms.py
index f27a259cecae82bcbfbe77ce6f4a559b6cf04295..bc97e8b069bc1abefce9d7628d9384392f8c5995 100644
--- a/smash/web/forms/study_subject_forms.py
+++ b/smash/web/forms/study_subject_forms.py
@@ -14,19 +14,9 @@ logger = logging.getLogger(__name__)
 
 
 class StudySubjectForm(ModelForm):
-    datetime_contact_reminder = forms.DateTimeField(label="Contact on",
-                                                    widget=forms.DateTimeInput(
-                                                        DATETIMEPICKER_DATE_ATTRS),
-                                                    required=False
-                                                    )
-
-    referral_letter = forms.FileField(
-        label='Referral letter', widget=SecuredFileWidget(), required=False)
-
-    voucher_types = forms.ModelMultipleChoiceField(required=False,
-                                                   widget=forms.CheckboxSelectMultiple,
-                                                   queryset=VoucherType.objects.all(),
-                                                   )
+    datetime_contact_reminder = forms.DateTimeField(label="Contact on", widget=forms.DateTimeInput(DATETIMEPICKER_DATE_ATTRS), required=False)
+    referral_letter = forms.FileField(label='Referral letter', widget=SecuredFileWidget(), required=False)
+    voucher_types = forms.ModelMultipleChoiceField(required=False, widget=forms.CheckboxSelectMultiple, queryset=VoucherType.objects.all())
 
     def __init__(self, *args, **kwargs):
         super(StudySubjectForm, self).__init__(*args, **kwargs)
@@ -57,8 +47,7 @@ class StudySubjectAddForm(StudySubjectForm):
         if not screening_number:
             prefix_screening_number = self.get_prefix_screening_number()
             if prefix_screening_number is not None:
-                screening_number = get_new_screening_number(
-                    prefix_screening_number)
+                screening_number = get_new_screening_number(prefix_screening_number)
         return screening_number
 
     def clean(self):
@@ -79,8 +68,7 @@ class StudySubjectAddForm(StudySubjectForm):
         else:
             subject_type = self.cleaned_data.get('type', None)
             if subject_type is not None:
-                screening_number_prefix = SCREENING_NUMBER_PREFIXES_FOR_TYPE[
-                    subject_type]
+                screening_number_prefix = SCREENING_NUMBER_PREFIXES_FOR_TYPE[subject_type]
         if screening_number_prefix is None:
             return None
         prefix_screening_number = screening_number_prefix + "-"
@@ -89,8 +77,7 @@ class StudySubjectAddForm(StudySubjectForm):
 
 def get_new_screening_number(screening_number_prefix):
     result_number = 0
-    subjects = StudySubject.objects.filter(
-        screening_number__contains=screening_number_prefix)
+    subjects = StudySubject.objects.filter(screening_number__contains=screening_number_prefix)
     for subject in subjects:
         screening_numbers = subject.screening_number.split(";")
         for screening_number in screening_numbers:
@@ -199,8 +186,7 @@ def validate_subject_screening_number(self, cleaned_data):
         subjects_from_db = StudySubject.objects.filter(screening_number=cleaned_data["screening_number"],
                                                        study=self.study)
         if len(subjects_from_db) > 0:
-            self.add_error('screening_number',
-                           "Screening number already in use")
+            self.add_error('screening_number', "Screening number already in use")
 
 
 def validate_subject_nd_number(self, cleaned_data):