function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Frank, Christa', 2],
    ['Janssen, Arie W.', 1],
    ['Rampal, Jeannine', 23],
    ['Rützler, Klaus & Hooper, John N. A.', 2],
    ['Salvador, Xavier & Fernández-Vilert, Robert & Moles, Juan', 4],
    ['Verhaegen, Gerlien & Cimoli, Emiliano & Lindsay, Dhugal', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=34)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);