function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Buhl, Peter Neerup', 1],
    ['Choi, Jun-Yeol & Kozlov, Mikhail A.', 1],
    ['Madl, Michael', 5],
    ['Mani, M. S. & Sharma, S. K.', 1],
    ['Mukerjee, M. K.', 1],
    ['Risbec, J.', 2],
    ['Taekul, Charuwat & Johnson, Norman F. & Masner, Lubomír', 20]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    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);