function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aliyev, Azer & Maharramova, Sheyda', 1],
    ['Broad, Gavin R.', 4],
    ['Gadallah, N. S. & Ahmed, R. S. & Heneidy, A. H. El-', 1],
    ['Ghahari, H. & Jussila, R.', 1],
    ['Ghahari, Hassan & Jussila, Reijo', 1],
    ['Kolarov, J.', 4],
    ['Riedel, Matthias & Ameri, Ali & Talebi, Ali Asghar', 2],
    ['Varga, O.', 5],
    ['Varga, Oleksandr', 3],
    ['Yildirim, Erol & Tezcan, Serdar', 1],
    ['Çoruh, S. & Özbek, H.', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=26)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);