function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Grootaert, Patrick', 9],
    ['Selivanova, Olga V. & Grichanov, Igor Ya.', 1],
    ['Wang, Meng-Qing & Chen, Hong-Yin & Yang, Ding', 5],
    ['Wang, Mengqing & Chen, Hongyin & Yang, Ding', 8],
    ['Wang, Mengqing & Yang, Ding & Grootaert, Patrick', 9],
    ['Ya, Igor', 3],
    ['Zhang, Lili & Yang, Ding', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=39)',
    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);