function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['A. W', 1],
    ['Boustani, Mira & Rasmont, Pierre & Dathe, Holger H.', 4],
    ['Byvaltsev, A. M. & Belova, K. A. & Danilov, Yu. N.', 1],
    ['El-Hawagry, Magdi S. & Sharaf, Mostafa R. & Al Dhafer, Hathal M.', 1],
    ['Güler, Y.', 2],
    ['Lhomme, Patrick', 4],
    ['Niu, Zeqing & Yuan, Feng & Zhu, Chaodong', 6],
    ['Risch, Stephan & Roberts, Stuart P. M. & Smit, Jan', 2],
    ['S, Victor & Hopfenmüller, Sebastian & Schoder, Sabine', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);