function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hippa, Heikki & Vilkamaa, Pekka', 22],
    ['Kauschke, Ellen', 5],
    ['Mohrig, Werner & Kauschke, Ellen & Broadley, Adam', 1],
    ['Vilkamaa, Pekka & Hippa, Heikki & Mohrig, Werner', 6],
    ['Vilkamaa, Pekka & Komarova, Lyudmila A. & Hippa, Heikki', 10],
    ['Vilkamaa, Pekka & Menzel, Frank & Hippa, Heikki', 16],
    ['Zhang, Su-Jiong & Huang, Junhao & Wu, Hong & Wang, Yi-ping', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=67)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);